This maintenance release adjusts a test of formatDate()
to be compatible with recent changes in R-devel.
residuals.hhh4() can now also compute
type = "pearson" residuals.
The standard frequency() and start()
generics can now be used to extract the respective slots from an
"sts" object.
When indexing a spatial "sts" object that contains a
map by region names, i.e., <sts>[,<character>],
the additional argument drop = TRUE can now be used to
subset the map accordingly.
algo.twins() implementation of Held et
al. (2006) has been removed from the package. The source code has
been migrated to a separate R package, twins, which is
archived at https://codeberg.org/EE-hub/twins.update.hhh4(S =) can now be used for a previously
disabled model component, when it simply uses f = ~1 and
adds the requested number of harmonics (but gives a warning as the
specification may need to be tweaked, e.g., for an offset).The sts() constructor now also accepts an
"sf" object as map input; it is internally
converted to "SpatialPolygons" as required by the
"sts" class. (Based on a patch by Sophie
Reichert.)
as.epidataCS() is faster in determining potential
event sources.
backprojNP(eq3a.method="C") and
as.epidataCS()) were using it (inefficiently) and have been
replaced by C implementations. This also reduces the size of the
installed package.update.epidataCS() gained an argument
stgrid to update the spatio-temporal grid data in an
existing "epidataCS" object. This enables
updates/transformations of endemic variables and/or changes of the time
intervals without needing to do as.epidataCS() from
scratch.Start values for endemic intercepts in twinstim()
are now robust against non-finite values in offset terms.
intensityplot.twinstim(aggregate = "space") no
longer fails for endemic-only fits.
pit() plot could lack some tick marks on the y-axis
(for R >= 4.2.0).unionSpatialPolygons() and
polyAtBorder() now use sf in place of
rgeos.Long unused methods for "gpc.poly" objects (from
package gpclib) have now been removed and
surveillance.options("gpclib") is obsolete.
Package rgeos is no longer available as a
clipper method for as.epidataCS(). The
previous default polyclip remains as the only
option.
This is a maintenance release, fixing encoding-related portability issues and increasing test coverage for rarely used functionality.
nbOrder() has been re-implemented: it is now more
efficient and no longer depends on spdep. Furthermore,
it now defaults to maxlag = Inf; the historical default
maxlag = 1 was barely useful. It no longer messages (about
the range of the detected orders).
Printing "sts" objects with a map now shows the
first row of the attached data (if present) instead of the object
summary.
surveillance no longer relies on the
maptools package: unionSpatialPolygons()
with method = "gpclib" is deprecated and now uses the
default method with a warning.
Long unused scale.gpc.poly() and
inside.gpc.poly() are deprecated; the unused and
undocumented diameter.gpc.poly() method has been
removed.
stsplot_spacetime() is formally deprecated; it has
long been superseded by stsplot_space() and an
animate() method for "sts" objects.
vignette("monitoringCounts") now uses
knitr as its engine to work around Bug
18318.plotHHH4_fitted() can now produce simple (unformatted)
time indexes if argument xaxis = NA.Various documentation improvements, including an example for
predict.hhh4().
intensityplot.twinstim() no longer depends on
package maptools.
hhh4() now warns about interaction terms in model
formulae. These are not implemented and were silently ignored
previously.
Fixed a memory leak in algo.twins(); note that this
old experimental MCMC implementation for a two-component epidemic model
may be removed in future versions of the package.
ks.plot.unif(): accommodate to
NO_S_TYPEDEFS in R >= 4.3.0.
boda() with samplingMethod="marginals"
gave all-NA upperbounds in INLA >= 21.07.10.
boda() now also works around a scoping issue (with
E) in recent versions of INLA that led to wrongly scaled
upperbounds.
plotHHH4_season() gained a period
argument to support harmonics with periods longer than the frequency of
the "sts" object.
stsplot_space() now supports passing a
col argument to sp::spplot() to change the
colour of the polygon lines.
plotHHH4_fitted() can now handle time series with
missing values.
If the Nelder-Mead optimizer is used for the variance parameters
in hhh4(), it is now limited to 500 (not 300) iterations by
default (consistent with the default in optim()).
Printing an "sts" object now omits the
neighbourhood component if that was not set
(all-NA prototype).
simulate.hhh4(..., simplify = TRUE) now consistently
returns a 3d array (nTime x nUnit x nsim), even for
nsim = 1 (for which plotting now works).
The default legend in stsplot_time1() now only
includes plotted elements.
wrap.algo() no longer prints progress when there is
only one area.
summary.hhh4() now prints the number of excluded
observations (due to missingness), if any.
The print-method for summary.hhh4() did
not apply the digits argument to the coefficient matrix.
Furthermore, printing of estimated variance parameters now adheres to
significant digits as documented.
The [-method for the "hhh4sims" class
was not registered and thus only available internally. Array-like
subsetting of simulated counts now retains the class.
farringtonFlexible() with activated
populationOffset (non-default) always used the population
data of the first time series in the fitting step while
iterating over a multivariate "sts" object.
plotHHH4_ri(..., exp = TRUE) failed to use a
log-scale color axis if further colorkey options were
passed in a list. The (default) color breaks could fail to span the
range of the data without warning (resulting in unfilled polygons). This
is now checked and the default breaks are now equally spaced on the
log-scale.
stsplot_time1() did not pass lty to
polygon() and lwd to
legend().
rps() was wrong for distributions close to a point
mass at zero, e.g., for mu = 1e-3 and
x >= 4. It is now also protected against wide
(quasi-continuous) NegBin distributions that would consume too much
memory with discrete RPS calculation (returning a missing value with a
warning). [both issues spotted by F. Rousseu]
Plots of legacy "disProg" and "survRes"
objects are now generated via internal disProg2sts()
conversion and stsplot_time(). This fixes their x-axis
labels for the default xaxis.years=TRUE. The obsolete
arguments startyear and firstweek are now
ignored with a warning.
The default legend of stsplot_time1() did not show
the fill color in the non-default case
!is.na(col[1]).
Multivariate hhh4() with neighbourhood component
treated NA counts as zero when calculating the weighted sum
over units. A missing count at t-1 in any unit now gives
NA values for the neighbourhood terms of all units at time
t, thus reducing nobs().
create.disProg() is deprecated. Methods for legacy
"disProg" objects are kept for backwards compatibility, but
new projects should use sts().
The long-deprecated qlomax() implementation has been
removed.
The CRS of data(imdepi) and
data(measlesWeserEms) have been updated via
sp::rebuild_CRS() to avoid warnings when
rgdal is loaded with new PROJ and GDAL
libraries.
simEpidataCS() now internally resets the CRS
(temporary), which avoids spurious warnings and also reduces its runtime
by about 25%.
Fix encoding error in vignette("twinstim") for
CRAN’s non-UTF8 Linux test machine.
This version of surveillance (formally) requires the new spatstat umbrella package to avoid collisions of old spatstat and its new sub-packages (we only use spatstat.geom). The spatstat dependence will be dropped in the future.
The epoch<- replacement method for
"sts" objects now accepts a "Date" vector. The
standard plots may give nicer x-axis annotation if indexed by dates. See
the xaxis.* arguments of
stsplot_time().
tidy.sts() (and thus autoplot.sts())
failed for date-indexed "sts" objects with non-standard
frequencies. [spotted by Junyi Lu]
The nowcast() function with
method="bayes.trunc.ddcp" now adds support for negative
binomial response distribution instead of Poisson. Furthermore,
additional components of the design matrix for the discrete time
survival model can be provided, which allows the inclusion of, e.g., day
of the week effects. Finally, the order of the polynomial created by the
change-points in the discrete time survival model can now be specified.
For further details see the work of Guenther et al. (2020) about
nowcasting the Covid-19 outbreak in Bavaria, Germany.
animate.sts() can position the timeplot
on other sides of the map.
The weighted sum in the neighbourhood component of
hhh4() models is computed more efficiently.
simEpidataCS() (and thus
simulate.twinstim()) uses a slightly more efficient
location sampler for models with siaf = siaf.constant().
Simulation results will differ from previous package versions even if
the same random seed is used.
The default main title for
stsplot_space() now uses the ISO year-week format for
weekly "sts" data.
Bug fix in the farringtonFlexible()-function, which
for the argument thresholdMethod=="nbPlugin" and
thresholdMethod=="muan" unfortunately computed the limit as
an (1-alpha/2) prediction interval instead of the
documented (1-alpha) prediction interval. This affects four
threshold values in Table 2 of
vignette("monitoringCounts"). The default method
"delta" worked as expected.
In hhh4() models without AR component, the matrix of
fitted values could lack column names.
Experimental time-varying neighbourhood weights in
hhh4() were indexed differently in model fitting and in the
simulate() method (undocumented behaviour). Both now use
the latter variant, where the mean at time t uses products of
weights at time t and observed counts at time t-1.
[reported by Johannes Bracher]
For weekly sts indexed via start and
freq=52, epoch(sts, as.Date=TRUE) now
interprets the start week according to ISO 8601. For
example, start = c(2020, 5) corresponds to 2020-01-27, not
2020-02-03. This affects as.xts.sts() and the time plot in
animate.sts().
stsplot_space() automatically extends manual color
breaks (at), if the intervals do not cover the data
range.
simEndemicEvents() and thus
epitest(..., method="simulate") are no longer slowed down
by intermediate sp::CRS() computations.
Removed unused rmapshaper from “Suggests” and
moved xts to “Enhances” (used only for
as.xts.sts).
Switched testing framework from (nowadays heavy)
testthat to tinytest.
Together with moving ggplot2 to “Enhances” (used only
for autoplot.sts) — and only then — this switch further
reduces the total number of required packages for a complete check
(i.e., installing with dependencies = TRUE) in a
factory-fresh R environment from 119 to 94.
spatstat
was split into several sub-packages, of which we only need to import spatstat.geom.
This new package requires R >= 3.5.0, though.
surveillance now requires
R >= 3.6.0.
New spatial interaction function for twinstim():
siaf.exponential() implements the exponential kernel
f(x) = exp(-x/σ), which is a useful alternative if the
two-parameter power-law kernel is not identifiable.
The plot-type "maps" for
"hhh4" fits, plotHHH4_maps(), now allows for
map-specific color keys via zmax = NA (useful for
prop = TRUE).
The nowcast()-function now also works for
method="bayes.trunc.ddcp" method when the number of
breakpoints is greater than 1.
The amplitudeShift transformation for sine-cosine
coefficient pairs in the summary of multivariate
"hhh4" models was incorrect in the rare case that the model
used unit-specific seasonal terms (addSeason2formula with
length(S) > 1).
algo.hhh() implementation of the HHH model
has been removed from the package. The function hhh4()
provides an improved and much extended implementation since 2012.The head()-method for "epidataCS"
objects did not work with a negative n argument.
Fix for "matrix" changes in R-devel.
sts() now checks for
mismatches in column names of supplied matrices (observed,
population, neighbourhood, …). This is to
catch input where the units (columns) are ordered differently in
different slots, which would flaw subsequent analyses.simulate.twinSIR() ignored the atRiskY
indicator of the underlying "epidata", so always assumed a
completely susceptible population. Initially infectious individuals are
now inherited. For the previous behaviour, adjust the supplied
data via data$atRiskY <- 1.siaf.powerlaw1()
with fixed sigma = 1. Useful if sigma is
difficult to estimate with siaf.powerlaw().pit()’s default ylab was wrong (default
are densities not relative frequencies).
R0() for "twinstim" fits with specified
newevents now handles levels of epidemic factor variables
automatically via the new xlevels attribute stored in the
fitted model.
Some S3 methods for the "sts" class are now formally
registered and identical to the established S4 methods.
Minor additions and fixes in the package documentation.
hcl.colors(), exported since 1.14.0, has been renamed
.hcl.colors() and is now internal again, to avoid a name
clash with R’s own such function introduced in R 3.6.0.W_powerlaw(..., from0 = TRUE) enables more
parsimonious hhh4 models in that the power-law weights are
modified to include the autoregressive (0-distance) case (see
vignette("hhh4_spacetime")). The unstructured distance
weights W_np() gained from0 support as
well.
sts() creation can now handle epoch
arguments of class Date directly.
The ranef()-method for "hhh4" fits
gained a logical argument intercept to extract the
unit-specific intercepts of the log-linear predictors instead of the
default zero-mean deviations around the fixed intercepts. The
corresponding plot method (type="ri") gained
an argument exp: if set to TRUE random effects
are exp-transformed and thus show multiplicative effects.
[based on feedback by Tim Pollington]
W_np()’s argument to0 has been renamed
to truncate. The old name still works but is
deprecated.
plotHHH4_ri() now uses cm.colors(100)
as col.regions, and 0-centered color breaks by
default.
The help pages of twinSIR() and related functions
now give examples based on data("hagelloch") instead of
using the toy dataset data("fooepidata"). The latter is now
obsolete and will be removed in future versions of the package.
The elements of the control list stored in the
result of algo.farrington() are now consistently ordered as
in the default control argument.
Using negative indices to exclude time points from an
"sts" object (e.g., x[-1,]) is now supported
and equivalent to the corresponding subset expression of retained
indexes (x[2:nrow(x),]) in resetting the start
and epoch slots. [reported by Johannes Bracher]
For weekly "sts" data with
epochAsDate=TRUE, the as.data.frame() method
computed freq by "%Y"-year instead of by
"%G"-year, which was inconsistent with the
epochInPeriod variable.
For non-weekly "sts" data with
epochAsDate=TRUE, year() as well as the
year column of the tidy.sts() output
corresponded to the ISO week-based year. It now gives the calendar
year.
sts_creation() hard-coded
start = c(2006, 1).
aggregate()ing an "sts" object over
time now recomputes fractions from the cumulated population values if
and only if this is no multinomialTS and already contains
population fractions. The same rule holds when subsetting units of an
"sts" object. The aggregate-method previously
failed to recompute fractions in some cases.
For farringtonFlexible() with multivariate time
series, only the last unit had stored the additional control items
(exceedence scores, p-values, …), all others were 0. [reported by
Johannes Bracher]
The supplementary p-values returned by
farringtonFlexible() in control$pvalue were
wrong for the default approach, where
thresholdMethod="delta" (the original Farrington method)
and a power transformation was applied to the data
(powertrans != "none"). Similarly,
algo.farrington() returned wrong predictive probabilities
in control$pd[,1] if a power transformation was used.
[reported by Lore Merdrignac]
The control argument list of
algo.farrington() as stated in the formal function
definition was incomplete (plot was missing) and partially
out of sync with the default values that were actually set inside the
function (b=5 and alpha=0.05). This has been
fixed. Results of algo.farrington() would only be affected
if the function was called without any control options
(which is hardly possible). So this can be regarded as a documentation
error. The formal control list of the
farrington() wrapper function has been adjusted
accordingly.
The control argument lists of
farringtonFlexible() and bodaDelay() as stated
in the formal function definitions were partially out of sync with
respect to the following default values that were actually set inside
these functions: b=5 (not 3), alpha=0.05 (not
0.01), pastWeeksNotIncluded=w (not 26), and, for
bodaDelay() only, delay=FALSE (not
TRUE). This has been fixed. Results would only be affected
if the functions were called without any control options
(which is hardly possible). So this can be regarded as a documentation
error.
pairedbinCUSUM() did not properly subset the
sts object if a range was specified, and
forgot to store the control arguments in the
result.
wrap.algo() now aborts if the monitored range is not
supplied as a numeric vector.
In vignette("monitoringCounts"): several
inconsistencies between code and output have been fixed.
epidataCS2sts() no longer transfers the
stgrid$BLOCK indices to the epoch slot of the
resulting "sts" object (to avoid epoch[1] != 1
scenarios).
The ranef() matrix extracted from fitted
"hhh4" models could have wrong column names.
compMatrix.writeTable(), makePlot(),
test(), testSim(), readData()
(the raw txt files have been removed as well),
correct53to52(), enlargeData(),
toFileDisProg().autoplot.sts() gained a width argument
to adjust the bar width, which now defaults to 7 for weekly time series
(previously was 90% of that so there were gaps between the
bars).
"epidataCS" generation now (again) employs spatstat’s
bdist.points(), which has been accelerated in version
1.56-0. If you use the twinstim()-related modelling part of
surveillance, you are thus advised to update your
spatstat installation.
The boda() examples in
vignette("monitoringCounts") have been updated to also work
with recent versions of INLA.
Offsets in hhh4’s epidemic components were ignored
by simulate.hhh4() [spotted by Johannes Bracher] as well as
in dominant eigenvalues (“maxEV”).
The color key in fanplot() is no longer distorted by
log="y".
autoplot.sts() now sets the calling environment as
the plot_env of the result.
Several twinstim-related functions finally allow for
prehistory events (long supported by twinstim() itself):
as.epidataCS(), glm_epidataCS(),
as.epidata.epidataCS().
The summary() for SI[R]S-type "epidata"
failed if there were initially infectious individuals.
qlomax(),
readData(), toFileDisProg(),
correct53to52(), enlargeData(),
compMatrix.writeTable(), test(),
testSim(), makePlot().The as.data.frame() method for "sts"
objects gained a tidy argument, which enables conversion to
the long data format and is also available as function
tidy.sts().
A ggplot2
variant of stsplot_time() is now available via
autoplot.sts().
as.epidata.data.frame() gained an argument
max.time to specify the end of the observation period
(which by default coincides with the last observed event).
The now exported function fanplot() wraps fanplot::fan().
It is used by plot.oneStepAhead() and
plot.hhh4sims(), which now have an option to add the point
forecasts to the fan as well.
plotHHH4_fitted() (and
plotHHH4_fitted1()) gained an option total to
sum the fitted components over all units.
Package polyCub is no longer automatically attached (only imported).
scores.oneStepAhead() no longer reverses the
ordering of the time points by default, as announced in 1.15.0.
Some code in vignette("monitoringCounts") has been
adjusted to work with the new version of MGLM
(0.0.9).
Added a [-method for the "hhh4sims"
class to retain the attributes when subsetting simulations.
aggregate(stsObj, by = "unit") no longer results in
empty colnames (set to "overall"). The obsolete map is
dropped.
The subset argument of twinSIR() was
partially ignored:
If nIntervals = 1, the model summary()
reported the total number of events.
Automatic knots, model residuals(), as
well as the rug in intensityplot() were computed from the
whole set of event times.
The as.epidata.data.frame() converter did not
actually allow for latent periods (via tE.col). This is now
possible but considered experimental (methods for "epidata"
currently ignore latent periods).
The all.equal() methods for "hhh4" and
"twinstim" objects now first check for the correct
classes.
siaf.gaussian() now also employs a
polyCub.iso() integration routine by default (similar to
the powerlaw-type kernels), instead of adaptive midpoint cubature. This
increases precision and considerably accelerates estimation of
twinstim() models with a Gaussian spatial interaction
function. Models fitted with the new default
(F.adaptive=FALSE, F.method="iso") will likely differ from
previous fits (F.adaptive=TRUE), and the numerical
difference depends on the adaptive bandwidth used before (the default
adapt=0.1 yielded a rather rough approximation of the
integral).
Added quantile(), confint(), and
plot() methods for "oneStepAhead"
predictions.
Exported the function simEndemicEvents() to simulate
a spatio-temporal point pattern from an endemic-only
"twinstim"; faster than via the general
simulate.twinstim() method.
twinstim(..., siaf = siaf.gaussian()) uses a larger
default initial value for the kernel’s standard deviation (based on the
size of the observation region).
Non-default parametrizations of siaf.gaussian() are
deprecated, i.e., always use logsd=TRUE and
density=FALSE.
twinstim() uses a smaller default initial value for
the epidemic intercept, which usually allows for faster
convergence.
update.hhh4() now allows subset.upper
values beyond the originally fitted time range (but still within the
time range of the underlying "sts" object).
scores.oneStepAhead() by default reverses the
ordering of the time points. This awkward behaviour will change in the
next version, so the method now warns if the default
reverse=TRUE is used without explicit
specification.
Minor improvements in the documentation and some vignettes: corrected typos, simplified example code, documented some methods.
The C-routines introduced in version 1.14.0 used ==
comparisons on parameter values to choose among case-specific formulae
(e.g., for d==2 in siaf.powerlaw()). We now employ
an absolute tolerance of 1e-7 (which should fix the failing tests on
Solaris).
Interaction functions for twinstim(), such as
siaf.powerlaw() or tiaf.exponential(), no
longer live in the global environment as this risks using masked base
functions.
demo("v77i11"). It exemplifies the spatio-temporal
endemic-epidemic modelling frameworks twinstim,
twinSIR, and hhh4 (see also the corresponding
vignettes).Pure C-implementations of integration routines for spatial
interaction functions considerably accelerate the estimation of
twinstim() models containing siaf.powerlaw(),
siaf.powerlawL(), or siaf.student().
The color palette generating function used by sts
plots, hcl.colors, is now exported.
The utility function clapply (conditional
lapply) is now exported.
Some utility functions for hhh4 fits are now
exported (update.hhh4, getNEweights,
coefW), as well as several internal functions for use by
hhh4 add-on packages (meanHHH,
sizeHHH, decompose.hhh4).
The "fan"-type plot function for
"hhh4sims" gained a key.args argument for an
automatic color key.
New auxiliary function makeControl(), which may be
used to specify a hhh4() model.
twinstim() now throws an informative error message when
trying to fit a purely epidemic model to data containing endemic events
(i.e., events without ancestors). The help("twinstim")
exemplifies such a model.siaf.powerlaw()$deriv returned NaN for
the partial derivative wrt the decay parameter d, if d
was large enough for f to be numerically equal to 0. It will
now return 0 in this case.
twinstim() could fail (with an error from
duplicated.default) if the fitted time range was
substantially reduced via the T argument.
The "simEpidataCSlist" generated by
simulate.twinstim(..., simplify = TRUE) was missing the
elements bbox and control.siaf.
vignette("twinstim"), vignette("twinSIR"), and
vignette("hhh4_spacetime"), respectively.The calibrationTest() and pit() methods
for "oneStepAhead" forecasts gained an argument
units to allow for unit-specific assessments.
A default scores-method is now available to compute
a set of proper scoring rules for Poisson or NegBin
predictions.
New plot type = "fan" for simulations from
"hhh4" models to produce a fan chart using the fanplot
package.
scores.hhh4() sets rownames for consistency with
scores.oneStepAhead()."Lambda.const" matrix returned by
getMaxEV_season() was wrong for models with asymmetric
neighbourhood weights. [spotted by Johannes Bracher]"maxEV") were not affected by this
bug.earsC now has two new arguments thanks to Howard
Burkom: the number of past time units to be used in calculation is now
not always 7, it can be chosen in the baseline parameter.
Furthermore, the minSigma parameter allows to get a
threshold in the case of sparse data. When one doesn’t give any value
for those two parameters, the algorithm works like it used to.
animate.sts() gained support for date labels in the
bottom timeplot.
stsplot_space() and animate.sts() can
now generate incidence maps based on the population information stored
in the supplied "sts" object. Furthermore,
animate.sts() now supports time-varying population
numbers.
hhh4() guards against the misuse of
family = factor("Poisson") for univariate time series.
Previously, this resulted in a negative binomial model by definition,
but is now interpreted as family = "Poisson" (with a
warning).animate.sts() now supports objects with missing
values (with a warning). Furthermore, the automatic color breaks have
been improved for incidence maps, also in
stsplot_space().
The as.data.frame-method for the "sts"
class, applied to classical time-index-based "sts" objects
(epochAsDate=FALSE), ignored a start epoch
different from 1 when computing the epochInPeriod indexes.
Furthermore, the returned epochInPeriod now is a fraction
of freq, for consistency with the result for objects with
epochAsDate=TRUE.
simulate.hhh4() did not handle shared overdispersion
parameters correctly. The different parameters were simply recycled to
the number of units, ignoring the factor specification from the model’s
family. [spotted by Johannes Bracher]
Simulations from endemic-only "hhh4" models
with unit-specific overdispersion parameters used wrong variances.
[spotted by Johannes Bracher]
oneStepAhead() predictions of type
"rolling" (or "first") were incorrect for time
points tp (tp[1]) beyond the originally fitted
time range (in that they were based on the original time range only).
This usage of oneStepAhead() was never really supported and
is now caught when checking the tp argument.
plot.hhh4simslist() ignored its
par.settings argument if groups=NULL
(default).
The internal auxiliary function, which determines the sets of
potential source events in "epidataCS" has been implemented
in C++, which accelerates as.epidataCS(),
permute.epidataCS(), and therefore epitest().
This is only really relevant for "epidataCS" with a large
number of events (>1000, say).
Negative-binomial hhh4() models may not converge for
non-overdispersed data (try, e.g.,
set.seed(1); hhh4(sts(rpois(104, 10)), list(family="NegBin1"))).
The resulting non-convergence warning message now mentions low
overdispersion if this is detected. [suggested by Johannes
Bracher]
An additional type="delay" option was added to the
plot method of stsNC objects. Furthermore, an
animate_nowcasts function allows one to animate a sequence
of nowcasts.
animate-method for "sts" objects,
the default top padding of lattice plots is now
disabled for the bottom timeplot to reduce the space
between the panels. Furthermore, the new option fill can be
used to make the panel of the timeplot as large as
possible.bodaDelay(): fixed spurious warnings from
rnbinom().
vignette("monitoringCounts"): fixed
boda-related code and cache to obtain same results as in
corresponding JSS paper.
vignette("monitoringCounts") illustrates the
monitoring of count time series in R with a particular focus on
aberration detection in public health surveillance. This vignette
corresponds to a recently accepted manuscript for the Journal of
Statistical Software (Salmon, Schumacher, and Höhle, 2016).Non-convergent hhh4() fits now obey the structure of
standard "hhh4" objects. In particular, such fits now also
contain the control and stsObj elements,
allowing for model update()s of non-convergent
fits.
knox() warns about symmetric input
matrices.
The code of boda() (with
samplingMethod="joint") and bodaDelay() (with
inferenceMethod="INLA") has been adjusted to a change of
arguments of INLA’s inla.posterior.sample
function. Accordingly, the minimum INLA version
required to run boda() and bodaDelay() is
0.0-1458166556.
The functions returned by W_powerlaw() now have the
package namespace as their environment to support situations where the
package is not attached.
Attaching package nlme
after surveillance no longer masks
"hhh4"’s ranef-method. (We now import the
fixef and ranef generics from
nlme.)
Several new vignettes illustrate endemic-epidemic modeling frameworks for spatio-temporal surveillance data:
vignette("twinstim")describes a spatio-temporal point process regression model.
vignette("twinSIR")describes a multivariate temporal point process regression model.
vignette("hhh4_spacetime")describes an areal time-series model for infectious disease counts.
These vignettes are based on a recently accepted manuscript for the Journal of Statistical Software (Meyer, Held, and Höhle, 2016).
Improved the documentation on various help pages.
The hhh4()-based analysis of
data("fluBYBW") has been moved to a separate demo script
‘fluBYBW.R’. Due to the abundance of models and the relatively long
runtime, we recommend to open the script in an editor rather than
running all the code at once using
demo("fluBYBW").
Overhaul of the "sts" implementation. This mostly
affects package-internal code, which is simpler, cleaner and better
tested now, but requires R >= 3.2.0 (due to
callNextMethod() bugs in older versions of R). Beyond that,
the user-level constructor function sts() now has explicit
arguments for clarity and convenience. For instance, its first argument
sets the observed slot and no longer needs to be named,
i.e., sts(mycounts, start=c(2016,3), frequency=12) works
just like for the classical ts() function.
stsplot_time(..., as.one=TRUE) is now implemented
(yielding a simple matplot of multiple time
series).
plotHHH4_season() now by default draws a horizontal
reference line at unity if the multiplicative effect of component
seasonality is shown (i.e., if intercept=FALSE).
Since surveillance 1.8-0, hhh4()
results are of class "hhh4" instead of "ah4"
(renamed). Legacy methods for the old class name "ah4" have
been removed.
The internal model preparation in twinstim() is more
efficient (the distance matrix of the events is only computed if event
sources actually need to be updated).
stsplot_spacetime() now recognizes its
opts.col argument.
Conversion from "ts" to "sts" using
as(ts, "sts") could set a wrong start time. For instance,
as(ts(1:10, start=c(1959,2), frequency=4), "sts")@start was
c(1959,1).
algo.twins() now also accepts "sts"
input and the automatic legend in the first plot of
plot.atwins() works again.
The experimental profile-method for
"twinstim" objects did not work if embedded
twinstim() fits issued warnings.
update.epidata() can now handle a distance matrix
D in the form of a classed "Matrix".
[suggested by George Wood]
glrnb() can now handle ret="cases" for
the generalized likelihood ratio detector based on the negative binomial
distribution. It’s based on a brute-force search and hence might be slow
in some situations.
boda() and bodaDelay() now support an
alternative method (quantileMethod="MM") to compute
quantiles based on the posterior distribution. The new method samples
parameters from the posterior distribution and then computes the
quantile of the mixture distribution using bisectionning, which is
faster and yields similar results compared to the original method
(quantileMethod="MC", still the default).
vignette("hhh4"), updated the package
description as well as some references in the documentation. Also
updated (the cache of) the slightly outdated
vignette("surveillance") to account for the corrected
version of algo.bayes() implemented since
surveillance 1.10-0.Fixed bug in categoricalCUSUM(), which ignored
alarms generated for the last time point in range.
Furthermore, the exact computation in case of returns of the type
"value" for the binomial are now checked through an
attribute.
Fixed bug in the estimateGLRNbHook function of
algo.glrnb, which ignored potential fixed
alpha values. If alpha is fixed this is now
taken into consideration while fitting the negative binomial function.
See revised help files for the details.
Made a hot-fix such that the algo.quality function
now also works for sts objects and if the
state or alarm slots consists of TRUE/FALSE
instead of 0/1.
intensity.twinstim() did not work for non-endemic
models.
A parallelized epitest() could fail with a strange
error message if some replications were left unassigned. This seems to
happen if forking is used (mclapply) with insufficient
memory. Incomplete replications are now ignored with a warning.
This package is now maintained by Sebastian Meyer, who has been an active co-author since version 1.3. We thank Michael Höhle for 10 years of maintenance ever since he created surveillance and published the package on CRAN in November 2005 for R 2.2.0.
Calibration tests for count data (Wei and Held, 2014, Test) are
now implemented and available as calibrationTest(). In
addition to a default method taking pure counts and predictive means and
dispersion parameters, there are convenient methods for
"hhh4" and "oneStepAhead" objects.
Shared overdispersion across units in negative binomial
hhh4() time series models (by specifying a factor variable
as the family argument).
scores() and pit() are now generic and
have convenient methods for "oneStepAhead" predictions and
"hhh4" fits.
The initial values used for model updates during the
oneStepAhead() procedure can now be specified directly
through the which.start argument (as an alternative to the
previous options "current" and
"final").
plotHHH4_fitted() (and
plotHHH4_fitted1()) gained an option decompose
to plot the contributions from each single unit (and the endemic part)
instead of the default endemic + AR + neighbours decomposition.
Furthermore, a formatted time axis similar to
stsplot_time1() can now be enabled via the new argument
xaxis.
The new plot type "maps"
for "hhh4" fits shows maps of the fitted mean components
averaged over time.
New plot-method for simulations from
"hhh4" models (using
simulate.hhh4(..., simplify = TRUE), which now has a
dedicated class: "hhh4sims") to show the final size
distribution or the simulated time series (possibly stratified by groups
of units). There is also a new scores-method to compute
proper scoring rules based on such simulations.
The argument idx2Exp of coef.hhh4() may
now be conveniently set to TRUE to exp-transform all
coefficients.
Added a coeflist()-method for "hhh4"
fits.
The generator function sts() can now be used to
initialize objects of class "sts" (instead of writing
new("sts", ...)).
Additional arguments of layout.scalebar() now allow
to change the style of the labels.
A pre-computed distance matrix D can now be used as
input for the as.epidata() converter – offering an
alternative to the default Euclidean distance based on the individuals
coordinates. (Request of George Wood to support twinSIR
models on networks.)
The first argument of scores() is now called
x instead of object (for consistency with
calibrationTest()).
The result of oneStepAhead() now has the dedicated
class attribute "oneStepAhead" (previously was just a
list).
Changed interpretation of the col argument of
plotHHH4_fitted() and plotHHH4_fitted1()
(moved color of “observed” to separate argument pt.col and
reversed remaining colors). The old col specification as a
vector of length 4 still works (caught internally) but is
undocumented.
The epoch slot of class "sts" is now
initialized to 1:nrow(observed) by default and thus no
longer needs to be explicitly set when creating a
new("sts", ...) for this standard case.
Initialization of new("sts", ...) now supports the
argument frequency (for consistency with
ts()). Note that freq still works (via partial
argument matching) and that the corresponding "sts" slot is
still called freq.
If missing(legend.opts) in
stsplot_time1(), the default legend will only be produced
if the "sts" object contains information on outbreaks,
alarms, or upperbounds.
The default summary() of a "twinstim"
fit is more concise since it no longer includes the number of
log-likelihood and score function evaluations and the elapsed time
during model fitting. Set the new runtime argument of
summary.twinstim() to TRUE to add this
information to the summary as before.
The animate-method for "sts" objects
gained an argument draw (to disable the default
instantaneous plotting) and now invisibly returns the sequential plot
objects (of class "gtable" or "trellis") in a
list for post-processing.
The flexible time axis configurations for "sts"
plots introduced in version 1.8-0 now also work for classical
"sts" objects with integer epochs and standard frequencies
(try plot(..., epochsAsDate = TRUE)).
stsplot_time() initiates par settings
only if the par.list argument is a list.
The new all.equal() method for class
"hhh4" compares two fits ignoring their
"runtime" and "call" elements (at
least).
Fixed a bug in algo.bayes, where an alarm was
already sounded if the current observation was equal to the quantile of
the predictive posterior. This was changed in order to get alarm_t =
I(obs_t > quantile_t) which is consistent with the use in
boda and bodaDelay.
Fixed bug in algo.outbreakP causing a halt in the
computations of value="cases" when
calc.outbreakP.statistic returned NaN. Now, a
NaN is returned.
wrap.algo argument control.hook used
control argument defined outside it’s scope (and not the
one provided to the function). It is now added as additional 2nd
argument to the control.hook function.
stsplot_time() did not account for the optional
units argument for multivariate "sts" objects
when choosing a suitable value for par("mfrow").
hhh4() could have used a function
dpois() or dnbinom() from the global
environment instead of the respective function from package
stats.
The default time variable t created as part of the
data argument in hhh4() was incompatible with
"sts" objects having
epochAsDate=TRUE.
A consistency check in as.epidata.default() failed
for SI-type data (and, more generally, for all data which ended with an
I-event in the last time block). [spotted by George Wood]
This is a quick patch release to make the test suite run smoothly on CRAN’s Windows and Solaris Sparc systems.
The new hhh4() option to scale neighbourhood weights
did not work for parametric weights with more than one parameter if
normalize=FALSE.
New functions and data for Bayesian outbreak detection in the
presence of reporting delays (Salmon et al., 2015):
bodaDelay(), sts_observation(), and
sts_creation().
New functions implementing tests for space-time interaction:
knox() supports both the Poisson approximation and a
Monte Carlo permutation approach to determine the p-value,
stKtest() wraps space-time K-function methods from
package splancs
for use with "epidataCS",
and epitest() for twinstim models
(makes use of the new auxiliary function
simpleR0()).
New function plapply(): a parallel and verbose
version of lapply() wrapping around both
mclapply() and parLapply() of package
parallel.
New converter as.xts.sts() to transform
"sts" objects to the quasi standard "xts"
class, e.g., to make use of package dygraphs
for interactive time series plots.
New options for scaling and normalization of neighbourhood
weights in hhh4() models.
New auxiliary function layout.scalebar() for use as
part of sp.layout in sp::spplot() or in the
traditional graphics system.
"epidataCS"New argument by for plot.epidataCS(),
which defines a stratifying variable for the events (default is the
event type as before). It can also be set to NULL to make
the plot not distinguish between event types.
The spatial plot of "epidataCS" gained the arguments
tiles, pop and sp.layout, and can
now produce an sp::spplot() with the tile-specific
population levels behind the point pattern.
New function permute.epidataCS() to randomly permute
time points or locations of the events (holding other marks
fixed).
twinstim()New S3-generic coeflist() to list model coefficients
by component. It currently has a default method and one for
"twinstim" and "simEpidataCS".
New argument newcoef for
simulate.twinstim() to customize the model parameters used
for the simulation.
New argument epilink for twinstim(),
offering experimental support for an identity link for the epidemic
predictor. The default remains epilink = "log".
Simulation from "twinstim" models and generation of
"epidataCS" is slightly faster now (faster
spatstat functions are used to determine the distance
of events to the border).
New option scaled = "standardized" in
iafplot() to plot f(x) / f(0) or g(t) /
g(0), respectively.
Initial data processing in twinstim() is faster
since event sources are only re-determined if there is effective need
for an update (due to subsetting or a change of
qmatrix).
formatPval() disables scientific
notation by default.
The "time" plot for "epidataCS" uses
the temporal grid points as the default histogram
breaks.
The special fe() function which sets up fixed
effects in hhh4() models gained an argument
unitSpecific as a convenient shortcut for
which = rep(TRUE, nUnits).
The convenient plot option of
permutationTest() uses MASS::truehist()
instead of hist() and accepts graphical parameters to
customize the histogram.
The bodaFit function did not draw samples from the
joint posterior. Instead draws were from the respective posterior
marginals. A new argument samplingMethod is now introduced
defaulting to the proper ‘joint’. For backwards compatibility use the
value ‘marginal’.
The functions as.epidataCS() and
simEpidataCS() could throw inappropriate warnings when
checking polygon areas (only if W or tiles,
respectively, contained holes).
Non-convergent endemic-only twinstim models produced
an error. [spotted by Bing Zhang]
The "owin"-method of
intersectPolyCircle could have returned a rectangle-type
"owin" instead of a polygon.
An error occurred in twinstim() if
finetune=TRUE or choosing optim() instead of
the default nlminb() optimizer without supplying a
control list in optim.args.
The "time" plot for "epidataCS" did not
necessarily use the same histogram breaks for all
strata.
Specifying a step function of interaction via a numeric vector of
knots did not work in twinstim().
plot.hhh4() did not support an unnamed
type argument such as
plot(x, "season").
simEpidataCS() did not work if t0 was
in the last block of stgrid (thus it did not work for
single-cell grids), and mislabeled the start column copied
to events if there were no covariates in
stgrid.
Evaluating intensity.twinstim()$hFUN() at time
points before t0 was an error. The function now returns
NA_real_ as for time points beyond T.
Truncated, normalized power-law weights for hhh4()
models, i.e., W_powerlaw(maxlag = M, normalize = TRUE) with
M < max(neighbourhood(stsObj)), had wrong derivatives
and thus failed to converge.
update.hhh4(..., use.estimates = TRUE) did not use
the estimated weight function parameters as initial values for the new
fit. It does so now iff the weight function ne$weights is
left unchanged.
Accommodate a new note given by R-devel checks, and set the new INLA additional repository in the ‘DESCRIPTION’ file.
Made linelist2sts() work for quarters by adding
extra "%q" formatting in
formatDate().
hhh4()In the coefficient vector resulting from a hhh4 fit,
random intercepts are now named.
Parameter start values in hhh4() are
now matched by name but need not be complete in that case (default
initial values are used for unspecified parameters).
The update.hhh4()-method now by default does
use.estimates from the previous fit. This reduces the
number of iterations during model fitting but may lead to slightly
different parameter estimates (within a tolerance of 1e-5).
Setting use.estimates = FALSE means to re-use the previous
start specification.
"sts" ClassFor univariate "sts" objects, the (meaningless)
“head of neighbourhood” is no longer shown.
The "sts" class now has a
dimnames-method instead of a colnames-method.
Furthermore, the redundant nrow and ncol
methods have been removed (the dim-method is
sufficient).
If a map is provided when
initialize()ing an "sts" object, it is now
verified that all observed regions are part of the
map (matched by row.names).
In stsplot_space(), extra (unobserved) regions of
the map are no longer dropped but shown with a dashed
border by default.
The R0-method for "twinstim" gained an
argument newcoef to simplify computation of reproduction
numbers with a different parameter vector (also used for Monte Carlo
CI’s).
New plot type="neweights" for "hhh4"
fits.
The scores() function allows the selection of
multiple units (by index or name) for which to compute
(averaged) proper scores. Furthermore, one can now select
which scores to compute.
Added a formula-method for "hhh4" fits
to extract the f specifications of the three components
from the control list.
The update()-method for fitted "hhh4"
models gained an argument S for convenient modification of
component seasonality using addSeason2formula().
The new auxiliary function layout.labels() generates
an sp.layout item for sp::spplot() in order to
draw labels.
When generating the pit() histogram with a single
predictive CDF pdistr, the ... arguments can
now be x-specific and are recycled if necessary using
mapply(). If pdistr is a list of CDFs,
pit() no longer requires the functions to be
vectorized.
New method as.epidata.data.frame(), which constructs
the start/stop SIR event history format from a simple individual-based
data frame (e.g., hagelloch.df).
New argument w in as.epidata.default()
to generate covariate-based weights for the force of infection in
twinSIR. The f argument is for distance-based
weights.
The result of profile.twinSIR() gained a class and
an associated plot-method.
For multivariate oneStepAhead() predictions,
scores(..., individual=TRUE) now returns a 3d array instead
of a collapsed matrix. Furthermore, the scores computed by default are
c("logs","rps","dss","ses"), excluding the normalized
squared error score "nses" which is improper.
The plot-type="season" for "hhh4" fits
now by default plots the multiplicative effect of seasonality on the
respective component (new argument intercept=FALSE). The
default set of components to plot has also changed.
When as.epidata() and simEpidata()
calculate distance-based epidemic weights from the f
functions, they no longer set the distance of an infectious individual
to itself artificially to Inf. This changes the
corresponding columns in the "epidata" in rows of currently
infectious individuals, but the twinSIR model itself is
invariant, since only rows with atRiskY=1 contribute to the
likelihood.
Several modifications and corrections in
data("hagelloch").
Better plotting of stsNC objects by writing an own
plot method for them. Prediction intervals are now shown jointly with
the point estimate.
Reduced package size by applying
tools::resaveRdaFiles to some large datasets and by
building the package with --compact-vignettes=both, i.e.,
using additional GhostScript compression with ebook quality, see
?tools::compactPDF.
Added units argument to stsplot_time to
select only a subset of the multivariate time series for
plotting.
The untie-method for class "epidataCS"
gained an argument verbose which is now FALSE
by default.
"epidataCS" objects store the clipper
used during generation as attribute of
$events$.influenceRegion.
In plotHHH4_fitted(), the argument
legend.observed now defaults to
FALSE.
The default weights for the spatio-temporal component in
hhh4 models now are
neighbourhood(stsObj) == 1. The previous default
neighbourhood(stsObj) does not make sense for the newly
supported nbOrder neighbourhood matrices (shortest-path
distances). The new default makes no difference for (old) models with
binary adjacency matrices in the neighbourhood slot of the
stsObj.
The default for nonparametric weights W_np() in
hhh4() is now to assume zero weight for neighbourhood
orders above maxlag, i.e., W_np()’s argument
to0 now defaults to TRUE.
Added a verbose argument to
permutationTest(), which defaults to FALSE.
The previous behaviour corresponds to
verbose=TRUE.
simulate.twinstim() now by default uses the original
data$W as observation region.
The data("measlesWeserEms") contain two additional
variables in the @map@data slot:
"vaccdoc.2004" and "vacc1.2004".
The plot-method for "epidata" objects now uses
colored lines by default.
The surveillance package now depends on R >= 3.0.2, which, effectively, is the minimum version required since surveillance 1.7-0.
The two diagnostic plots of checkResidualProcess()
are now by default plotted side by side (mfrow=c(1,2))
instead of one below the other.
In farringtonFlexible alarms are now for
observed>upperbound and not for
observed>=upperbound which was not correct.
Fixed duplicate "functions" element resulting from
update.twinstim(*,model=TRUE) and ensured that
"twinstim" objects always have the same components (some
may be NULL).
animate.epidata works again with the animation
package (ani.options("outdir") was removed in version
2.3)
For hhh4 models with random effects,
confint() only worked if argument parm was
specified.
Computing one-sided AIC weights by simulation for
twinSIR models with more than 2 epidemic covariates now is
more robust (by rescaling the objective function for the quadratic
programming solver) and twice as fast (due to code
optimization).
simulate.twinstim(..., rmarks=NULL) can now handle
the case where data has no events within the simulation
period (by sampling marks from all of
data$events).
The lambda.h values of simulated events in
"simEpidataCS" objects were wrong if the model contained an
endemic intercept (which is usually the case).
Automatic choice of color breaks in the
animate-method for class "sts" now also works
for incidence maps (i.e., with a population
argument).
hhh4() did not allow the use of nonparametric
neighbourhood weights W_np() with
maxlag=2.
scores() did not work for multivariate
oneStepAhead() predictions if both
individual=TRUE and sign=TRUE, and it could
not handle a oneStepAhead() prediction of only one time
point. Furthermore, the "sign" column of
scores(..., sign=TRUE) was wrong (reversed).
For "epidataCS" with only one event,
epidataCSplot_space() did not draw the point.
The trivial (identity) call
aggregate(stsObj, nfreq=stsObj@freq) did not work.
Package surveillance now depends on newer
versions of packages sp
(>= 1.0-15), polyCub
(>= 0.4-2), and spatstat
(>= 1.36-0). The R packages INLA and runjags
are now suggested to support a new outbreak detection algorithm
(boda()) and the new nowcast()ing procedure,
respectively. The R packages for lattice,
grid,
gridExtra,
and scales
are suggested for added visualization facilities.
More tests have been implemented to ensure package integrity. We now use testthat instead of the outdated package RUnit.
hhh4() fits now have class "hhh4"
instead of "ah4", for consistency with
twinstim(), twinSIR(), and to follow the
common convention (cp. lm()). Standard S3-methods for the
old "ah4" name are still available for backwards
compatibility but may be removed in the future.
Plot variants for "sts" objects have been cleaned
up: The functions implementing the various plot types
(stsplot_*, previously named plot.sts.*) are
now exported and documented separately.
The nowcast procedure has been completely re-written
to handle the inherit right-truncation of reporting data (best
visualized as a reporting triangle). The new code implements the
generalized-Dirichlet and the hierarchical Bayesian approach described
in Höhle and an der Heiden (2014). No backwards compatibility to the old
nowcasting procedure is given.
The package contains a new monitoring function boda.
This is a first experimental surveillance implementation of the Bayesian
Outbreak Detection Algorithm (BODA) proposed in Manitz and Höhle (2012).
The function relies on the non-CRAN package INLA, which
has to be installed first in order to use this function. Expect initial
problems.
New toLatex-method for "sts"
objects.
The new function stsplot_space() provides an
improved map plot of disease incidence for "sts" objects
aggregated over time. It corresponds to the new
type = observed ~ unit of the stsplot-method,
and supersedes type = observed ~ 1|unit (except for alarm
shading).
An animate()-method for the "sts" class
provides a new implementation for animated maps (superseding the
plot type=observed ~ 1 | unit * time) with an
optional evolving time series plot below the map.
The plot() method for "sts" objects
with epochs as dates is now made more flexible by introducing the
arguments xaxis.tickFreq, xaxis.labelFreq and
xaxis.labelFormat. These allow the specification of
tick-marks and labelling based on strftime compatible
conversion codes – independently if data are daily, weekly, monthly,
etc. As a consequence, the old argument xaxis.years is
removed. See stsplot_time() for more information.
Inference for neighbourhood weights in hhh4()
models: W_powerlaw() and W_np() both implement
weights depending on the order of neighbourhood between regions, a
power-law decay and nonparametric weights, i.e., unconstrained
estimation of individual weights for each neighbourhood order.
hhh4() now allows the inclusion of multiplicative
offsets also in the epidemic components "ar" and
"ne".
hhh4() now has support for lag != 1 in
the autoregressive and neighbor-driven components. The applied lags are
stored as component "lags" of the return value (previously
there was an unused component "lag" which was always 1 and
has been removed now).
oneStepAhead():
Added support for parallel computation of predictions using
parallel::mclapply().
New argument type with a new type
"first" to base all subsequent one-step-ahead predictions
on a single initial fit.
Nicer interpretation of verbose levels, and
txtProgressBar().
The plot()-method for fitted hhh4()
objects now offers three additional types of plots: component
seasonality, seasonal or time course of the dominant eigenvalue, and
maps of estimated random intercepts. It is documented and more
customizable. Note that argument order and some names have changed:
i -> units, title ->
names.
(Deviance) residuals()-method for fitted
hhh4() models.
Added methods of vcov() and nobs() for
the "hhh4" class. For AIC() and
BIC(), the default methods work smoothly now (due to
changes to logLik.hhh4() documented below).
New predefined interaction functions for twinstim():
siaf.student() implements a t-kernel for the
distance decay, and siaf.step() and
tiaf.step() provide step function kernels (which may also
be invoked by specifying the vector of knots as the siaf or
tiaf argument in twinstim).
Numerical integration over polygonal domains in the
F and Deriv components of
siaf.powerlaw() and siaf.powerlawL() is much
faster and more accurate now since we use the new
polyCub.iso() instead of polyCub.SV() from
package polyCub.
New as.stepfun()-method for "epidataCS"
objects.
plot.epidataCS():
The spatial plot has new arguments to automatically add legends
to the plot: legend.types and legend.counts.
It also gained an add argument.
The temporal plot now supports type-specific sub-histograms, additional lines for the cumulative number of events, and an automatic legend.
The new function glm_epidataCS() can be used to fit
an endemic-only twinstim() via glm(). This is
mainly provided for testing purposes since wrapping into
glm usually takes longer.
Fitted hhh4() objects no longer contain the
associated "sts" data twice: it is now only stored as
$stsObj component, the hidden duplicate in
$control$data$.sts was dropped, which makes fitted objects
substantially smaller.
logLik.hhh4() always returns an object of class
"logLik" now; for random effects models, its
"df" attribute is NA_real_. Furthermore, for
non-convergent fits, logLik.hhh4() gives a warning and
returns NA_real_; previously, an error was thrown in this
case.
oneStepAhead():
Default of tp[2] is now the penultimate time point
of the fitted subset (not of the whole stsObj).
+1 on rownames of $pred (now the same
as for $observed).
The optional "twinstim" result components
fisherinfo, tau, and functions
are always included. They are set to NULL if they are not
applicable instead of missing completely (as before), such that all
"twinstim" objects have the same list structure.
iafplot() …
invisibly returns a matrix containing the plotted values of the
(scaled) interaction function (and the confidence interval as an
attribute). Previously, nothing (NULL) was
returned.
detects a type-specific interaction function and by default uses
types=1 if it is not type-specific.
has better default axis ranges.
adapts to the new step function kernels (with new arguments
verticals and do.points).
supports logarithmic axes (via new log argument
passed on to plot.default).
optionally respects eps.s and eps.t,
respectively (by the new argument truncated).
now uses scaled=TRUE by default.
The argument colTypes of
plot.epidataCS(,aggregate="space") is deprecated (use
points.args$col instead).
The events in an "epidataCS" object no longer have a
reserved "ID" column.
hhh4() now stores the runtime just like
twinstim().
Take verbose=FALSE in hhh4() more
seriously.
hhh4() issues a warning() if
non-convergent.
The following components of a hhh4() fit now have
names: "se", "cov",
"Sigma".
The new default for pit() is to produce the
plot.
The twinstim() argument cumCIF now
defaults to FALSE.
update.twinstim() no longer uses recursive
modifyList() for the control.siaf argument.
Instead, the supplied new list elements ("F",
"Deriv") completely replace the respective elements from
the original control.siaf specification.
siaf.lomax() is now defunct (it has been deprecated
since version 1.5-2); use siaf.powerlaw() instead.
Allow the default adaptive bandwidth to be specified
via the F.adaptive argument in
siaf.gaussian().
Unsupported options (logpars=FALSE,
effRangeProb) have been dropped from
siaf.powerlaw() and siaf.powerlawL().
More rigorous checking of tiles in
simulate.twinstim() and
intensityplot.twinstim().
as.epidataCS() gained a verbose
argument.
animate.epidataCS() now by default does not draw
influence regions (col.influence=NULL), is
verbose if interactive(), and ignores
sleep on non-interactive devices.
The multiplicity-generic and its default method have
been integrated into spatstat
and are imported from there.
The polygon representation of Germany’s districts (
system.file("shapes", "districtsD.RData", package="surveillance")
) has been simplified further. The union of districtsD is
used as observation window W in
data("imdepi"). The exemplary twinstim() fit
data("imdepifit") has been updated as well. Furthermore,
row.names(imdepi$events) have been reset (chronological
index), and numerical differences in
imdepi$events$.influenceRegion are due to changes in polyclip
1.3-0.
The Campylobacteriosis data set campyDE, where
absolute humidity is used as concurrent covariate to adjust the outbreak
detection is added to the package to exemplify
boda().
New data("measlesWeserEms") (of class
"sts"), a corrected version of
data("measles.weser") (of the old "disProg"
class).
Fixed a bug in LRCUSUM.runlength where computations
were erroneously always done under the in-control parameter
mu0 instead of mu.
Fixed a bug during alarm plots (stsplot_alarm()),
where the use of alarm.symbol was ignored.
Fixed a bug in algo.glrnb where the overdispersion
parameter alpha from the automatically fitted
glm.nb model (fitted by estimateGLRNbHook) was
incorrectly taken as mod[[1]]$theta instead of
1/mod[[1]]$theta. The error is due to a different
parametrization of the negative binomial distribution compared to the
parametrization in Höhle and Paul (2008).
The score function of hhh4() was wrong when fitting
endemic-only models to a subset including the first time
point. This led to “false convergence”.
twinstim() did not work without an endemic offset if
is.null(optim.args$par).
Package gpclib
is no longer necessary for the construction of
"epidataCS"-objects. Instead, we make use of the new
dedicated package polyclip
(licensed under the BSL) for polygon clipping operations (via
spatstat::intersect.owin()). This results in a slightly
different $events$.influenceRegion component of
"epidataCS" objects, one reason being that
polyclip uses integer arithmetic. Change of
twinstim() estimates for a newly created
"epidataCS" compared with the same data prepared in earlier
versions should be very small (e.g., for data("imdepifit")
the mean relative difference of coefficients is 3.7e-08, while the
logLik() is all.equal()). As an alternative,
rgeos can still be chosen to do the polygon
operations.
The surveillance-internal code now depends on R
>= 2.15.2 (for nlminb() NA fix of PR#15052,
consistent rownames(model.matrix) of PR#14992,
paste0(), parallel::mcmapply()). However, the
required recent version of spatstat (1.34-0, for
polyclip) actually needs R >= 3.0.2, which therefore
also applies to surveillance.
Functions unionSpatialPolygons() and
intersectPolyCircle() are now exported. Both are wrappers
around functionality from different packages supporting polygon
operations: for determining the union of all subpolygons of a
"SpatialPolygons" object, and the intersection of a
polygonal and a circular domain, respectively.
discpoly() moved back from polyCub
to surveillance.
surveillance now Depends on polyCub
(>= 0.4-0) and not only Imports it (which avoids
::-references in .GlobalEnv-made functions).
Nicer default axis labels for iafplot().
For twinstim(), the default is now to
trace every iteration instead of every fifth only.
Slightly changed default arguments for
plot.epidata(): lwd (1->2),
rug.opts (col is set according to
which.rug)
twinstim() saves the vector of fixed
coefficients as part of the returned optim.args component,
such that these will again be held fixed upon
update().
The plot-method for hhh4()-fits allows
for region selection by name.
The polyCub-methods for cubature over polygonal
domains have been moved to the new dedicated package polyCub,
since they are of a rather general use. The discpoly()
function has also been moved to that package.
As a replacement for the license-restricted
gpclib package, the rgeos package is
now used by default (surveillance.options(gpclib=FALSE)) in
generating "epidataCS" (polygon intersections, slightly
slower). Therefore, when installing surveillance
version 1.6-0, the system requirements for rgeos
have to be met, i.e., GEOS must be available on the system. On Linux
variants this means installing ‘libgeos’ (‘libgeos-dev’).
The improved Farrington method described in Noufaily et
al. (2012) is now available as function
farringtonFlexible().
New handling of reference dates in algo.farrington()
for "sts" objects with epochAsDate=TRUE.
Instead of always going back in time to the next Date in the
"epoch" slot, the function now determines the
closest Date. Note that this might lead to slightly different
results for the upperbound compared to previously. Furthermore, the
functionality is only tested for weekly data (monthly data are
experimental). The same functionality applies to
farringtonFlexible().
To make the different retrospective modelling frameworks of the
surveillance package jointly applicable, it is now
possible to convert (aggregate) "epidataCS"
(continuous-time continuous-space data) into an "sts"
object (multivariate time series of counts) by the new function
epidataCS2sts.
Simulation from hhh4 models has been re-implemented,
which fixes a bug and makes it more flexible and compatible with a wider
class of models.
The map-slot of the "sts" class now
requires "SpatialPolygons" (only) instead of
"SpatialPolygonsDataFrame".
Re-implementation of oneStepAhead() for
hhh4-models with a bug fix, some speed-up and more
options.
Slight speed-up for hhh4() fits, e.g., by more use
of .rowSums() and .colSums().
Crucial speed-up for twinstim() fits by more
efficient code: mapply, dropped clumsy
for-loop in fisherinfo, new argument
cores for parallel computing via forking (not available on
Windows).
Using tiaf.exponential() in a
twinstim() now works with nTypes=1 for
multi-type data.
A legend can be added automatically in
iafplot().
The untie methods are now able to produce jittered
points with a required minimum separation
(minsep).
simulate.ah4 gained a simplify
argument.
New update-method for fitted
hhh4-models (class "ah4").
oneStepAhead() has more options: specify time range
(not only start), choose type of start values, verbose
argument.
pit() allows for a list of predictive distributions
(pdistr), one for each observation x.
New spatial auxiliary function polyAtBorder()
indicating polygons at the border (for a "SpatialPolygons"
object).
animate.epidataCS() allows for a main
title and can show a progress bar.
Changed parametrization of zetaweights() and
completed its documentation (now no longer marked as
experimental).
twinstim(...)$converged is TRUE if the
optimization routine converged (as before) but contains the failure
message otherwise.
Increased default maxit for the Nelder-Mead
optimizer in hhh4 from 50 to 300, and removed default
artificial lower bound (-20) on intercepts of epidemic
components.
Renamed returned list from oneStepAhead
(mean->pred, x->observed, params->coefficients,
variances->Sigma.orig) for consistency, and
oneStepAhead()$psi is only non-NULL if we have
a NegBin model.
Argument order of pit() has changed, which is also
faster now and got additional arguments relative and
plot.
twinstim(...)$runtime now contains the complete
information from proc.time().
Fixed a bug in function refvalIdxByDate() which
produced empty reference values (i.e. NAs) in case the Date
entries of epoch were not mondays. Note: The function works
by subtracting 1:b years from the date of the range value
and then takes the span -w:w around this value. For each
value in this set it is determined whether the closest date in the epoch
slot is obtained by going forward or backward. Note that this behaviour
is now slightly changed compared to previously, where we always
went back in time.
algo.farrington(): Reference values too far back in
time and hence not being in the "epoch" slot of the
"sts" object are now ignored (previously the resulting
NAs caused the function to halt). A warning is displayed in
this case.
hhh4: The entry (5,6) of the marginal
Fisher information matrix in models with random intercepts in all three
components was incorrect. If nlminb was used as optimizer
for the variance parameters (using the negative marginal Fisher
information as Hessian), this could have caused false convergence (with
warning) or minimally biased convergence (without warning). As a
consequence, the "Sigma.cov" component of the
hhh4() result, which is the inverse of the marginal Fisher
information matrix at the MLE, was also wrong.
untie.matrix() could have produced jittering greater
than the specified amount.
hhh4: if there are no random intercepts, the
redundant updateVariance steps are no longer
evaluated.
update.twinstim() did not work with
optim.args=..1 (e.g., if updating a list of models with
lapply). Furthermore, if adding the model component only,
the control.siaf and optim.args components
were lost.
earsC should now also work with multivariate
sts time-series objects.
The last week in data(fluBYBW) (row index 417) has
been removed. It corresponded to week 1 in year 2009 and was wrong (an
artifact, filled with zero counts only). Furthermore, the regions in
@map are now ordered the same as in
@observed.
Fixed start value of the overdispersion parameter in
oneStepAhead (must be on internal log-scale, not
reparametrized as returned by coef() by default).
When subsetting "sts" objects in time,
@start was updated but not @epoch.
pit gave NA results if any
x[-1]==0.
The returned optim.args$par vector in
twinstim() was missing any fixed parameters.
hhh4() did not work with time-varying neighbourhood
weights due to an error in the internal checkWeightsArray()
function.
Fixed obsolete .path.package() calls.
Small corrections in the documentation.
update.twinstim() performs better in preserving the
original initial values of the parameters.
New pre-defined spatial interaction function
siaf.powerlawL(), which implements a _L_agged power-law
kernel, i.e. accounts for uniform short-range dispersal.
New method for outbreak detection: earsC
(CUSUM-method described in the CDC Early Aberration Reporting System,
see Hutwagner et al, 2003).
Yet another p-value formatting function formatPval()
is now also part of the surveillance package.
polyCub.SV() now also accepts objects of classes
"Polygon" and "Polygons" for
convenience.
twinstim()New spatial interaction function siaf.powerlaw(), a
re-parametrization of the now-deprecated
siaf.lomax().
The temporal plot-method for class
"epidataCS" now understands the add parameter
to add the histogram to an existing plot window, and auto-transforms the
t0.Date argument using as.Date() if
necessary.
nobs() methods for classes "epidataCS"
and "twinstim".
New argument verbose for twinstim()
which, if set to FALSE, disables the printing of
information messages during execution.
New argument start for twinstim(),
where (some) initial parameter values may be provided, which overwrite
those in optim.args$par, which is no longer required (as a
naive default, a crude estimate for the endemic intercept and zeroes for
the other parameters are used).
Implemented a wrapper stepComponent() for
step() to perform algorithmic component-specific model
selection in "twinstim" models. This also required the
implementation of suitable terms() and
extractAIC() methods. The single-step methods
add1() and drop1() are also
available.
The update.twinstim() method now by default uses the
parameter estimates from the previous model as initial values for the
new fit (new argument use.estimates = TRUE).
as.epidataCS() checks for consistency of the area of
W and the (now really obligatory) area column in
stgrid.
simulate.twinstim() now by default uses the previous
nCircle2Poly from the data argument.
direction argument for
untie.epidataCS().
The toLatex-method for
"summary.twinstim" got different defaults and a new
argument eps.Pvalue.
New xtable-method for
"summary.twinstim" for printing the covariate effects as
risk ratios (with CI’s and p-values).
hhh4()New argument hide0s in the plot-method
for class "ah4".
New argument timevar for
addSeason2formula(), which now also works for long
formulae.
As requested by the CRAN team, examples now run faster. Some are
conditioned on the value of the new package option
"allExamples", which usually defaults to TRUE
(but is set to FALSE for CRAN checking, if timings are
active).
Moved some rarely used package dependencies to “Suggests:”, and also removed some unused packages from there.
Dropped strict dependence on gpclib,
which has a restricted license, for the surveillance
package to be clearly GPL-2. Generation of "epidataCS"
objects, which makes use of gpclib’s polygon
intersection capabilities, now requires prior explicit acceptance of the
gpclib license via setting
surveillance.options(gpclib = TRUE). Otherwise,
as.epidataCS() and simEpidataCS() may not be
used.
twinstim()Speed-up by memoisation of the siaf cubature (using
the memoise
package).
Allow for nlm-optimizer (really not
recommended).
Allow for nlminb-specific control
arguments.
Use of the expected Fisher information matrix can be disabled for
nlminb optimization.
Use of the effRange-trick can be disabled in
siaf.gaussian() and siaf.lomax(). The default
effRangeProb argument for the latter has been changed from
0.99 to 0.999.
The twinstim() argument nCub has been
replaced by the new control.siaf argument list. The old
nCub.adaptive indicator became a feature of the
siaf.gaussian() generator (named F.adaptive
there) and does no longer depend on the effRange
specification, but uses the bandwidth adapt*sd, where the
adapt parameter may be specified in the
control.siaf list in the twinstim() call.
Accordingly, the components "nCub" and
"nCub.adaptive" have been removed from the result of
twinstim(), and are replaced by
"control.siaf".
The "method" component of the
twinstim() result has been replaced by the whole
"optim.args".
The new "Deriv" component of siaf
specifications integrates the “siaf$deriv” function over a polygonal
domain. siaf.gaussian() and siaf.lomax() use
polyCub.SV() (with intelligent alpha
parameters) for this task (previously: midpoint-rule with naive
bandwidth)
scaled iafplot() (default
FALSE). The ngrid parameter has been renamed
to xgrid and is more general.
The "simulate" component of siaf’s
takes an argument ub (upperbound for distance from the
source).
Numerical integration of spatial interaction functions with an
Fcircle trick is more precise now; this slightly changes
previous results.
New S3-generic untie() with a method for the
"epidataCS" class (to randomly break tied event times
and/or locations).
Renamed N argument of polyCub.SV() to
nGQ, and a to alpha, which both
have new default values. The optional polygon rotation proposed by
Sommariva & Vianello is now also implemented (based on the
corresponding MATLAB code) and available as the new
rotation argument.
The scale.poly() method for "gpc.poly"
is now available as scale.gpc.poly(). The default return
class of discpoly() was changed from
"gpc.poly" to "Polygon".
An intensityplot()-method is now also implemented
for "simEpidataCS".
hhh4()Significant speed-up (runs about 6 times faster now, amongst others by many code optimizations and by using sparse Matrix operations).
hhh4() optimization routines can now be customized
for the updates of regression and variance parameters separately, which
for instance enables the use of Nelder-Mead for the variance updates,
which seems to be more stable/robust as it does not depend on the
inverse Fisher info and is usually faster.
The ranef() extraction function for
"ah4" objects gained a useful tomatrix
argument, which re-arranges random effects in a unit x effect matrix
(also transforming CAR effects appropriately).
Generalized hhh4() to also capture parametric
neighbourhood weights (like a power-law decay). The new function
nbOrder() determines the neighbourhood order matrix from a
binary adjacency matrix (depends on package spdep).
New argument check.analyticals (default
FALSE) mainly for development purposes.
Fixed sign of observed Fisher information matrix in
twinstim.
Simulation from the Lomax kernel is now correct (via polar coordinates).
Fixed wrong Fisher information entry for the overdispersion
parameter in hhh4-models.
Fixed wrong entries in penalized Fisher information wrt the combination fixed effects x CAR intercept.
Fixed indexing bug in penalized Fisher calculation in the case of multiple overdispersion parameters and random intercepts.
Fixed bug in Fisher matrix calculation concerning the relation of unit-specific and random effects (did not work previously).
Improved handling of non-convergent / degenerate solutions during
hhh4 optimization. This involves using ginv()
from package MASS,
if the penalized Fisher info is singular.
Correct labeling of overdispersion parameter in
"ah4"-objects.
Some control arguments of hhh4() have more clear
defaults.
The result of algo.farrington.fitGLM.fast() now
additionally inherits from the "lm" class to avoid warnings
from predict.lm() about fake object.
Improved ‘NAMESPACE’ imports.
Some additional tiny bug fixes, see the subversion log on R-Forge for details.
paste0() in the package
namespace if it is not found in R base at installation
of the surveillance package).Important new twinstim()-feature: fix parameters
during optimization.
Useful update-method for
"twinstim"-objects.
New [[- and plot-methods for
"simEpidataCSlist"-objects.
simEpidataCS() received tiny bug fixes and is now
able to simulate from epidemic-only models.
R0-method for "simEpidataCS"-objects
(actually a wrapper for R0.twinstim()).
Removed dimyx and eps arguments from
R0.twinstim(); now uses nCub and
nCub.adaptive from the fitted model and applies the same
(numerical) integration method.
animate.epidata is now compatible with the animation
package.
More thorough documentation of "twinstim"-related
functions including many examples.
twinstim()nlminb (instead of optim’s
"BFGS") is now the default optimizer (as already
documented).
The twinstim-argument nCub can now be
omitted when using siaf.constant() (as documented) and is
internally set to NA_real_ in this case. Furthermore,
nCub and nCub.adaptive are set to
NULL if there is no epidemic component in the
model.
toLatex.summary.twinstim now again works for
summary(*, test.iaf=FALSE).
print- and summary-methods for
"epidataCS" no longer assume that the BLOCK
index starts at 1, which may not be the case when using a subset in
simulate.twinstim().
The "counter" step function returned by
summary.epidataCS() does no longer produce false numbers of
infectives (they were lagged by one timepoint).
plot.epidataCS() now resolves … correctly and the
argument colTypes takes care of a possible
subset.
simEpidataCS() now also works for endemic-only
models and is synchronised with twinstim() regarding the
way how siaf is numerically integrated (including the
argument nCub.adaptive).
Fixed problem with simEpidataCS() related to missing
‘NAMESPACE’ imports (and re-exports) of marks.ppp and
markformat.default from spatstat,
which are required for spatstat::runifpoint() to work,
probably because spatstat currently does not register
its S3-methods.
Improved error handling in simEpidataCS(). Removed a
browser()-call and avoid potentially infinite
loop.
twinSIR()The .allocate argument of simEpidata()
has now a fail-save default.
Simulation without endemic cox()-terms now
works.
Simplified imdepi data to monthly instead of weekly
intervals in stgrid for faster examples and reduced package
size.
The environment of all predefined interaction functions for
twinstim() is now set to the .GlobalEnv. The
previous behaviour of defining them in the parent.frame()
could have led to huge save()’s of "twinstim"
objects even with model=FALSE.
simulate.twinSIR only returns a list of epidemics if
nsim > 1.
simulate.twinstim uses nCub and
nCub.adaptive from fitted object as defaults.
Removed the …-argument from simEpidataCS().
The coefficients returned by simEpidataCS() are now
stored in a vector rather than a list for compatibility with
"twinstim"-methods.
Argument cex.fun of
intensityplot.twinstim() now defaults to the
sqrt function (as in
plot.epidataCS().
Support for non-parametric back-projection using the function
backprojNP() which returns an object of the new
"stsBP" class which inherits from
"sts".
Bayesian nowcasting for discrete time count data is implemented
in the function nowcast().
Methods for cubature over polygonal domains can now also
visualize what they do. There is also a new quasi-exact method for
cubature of the bivariate normal density over polygonal domains. The
function polyCub() is a wrapper for the different
methods.
residuals.twinstim() and
residuals.twinSIR(): extract the “residual process”, see
Ogata (1988). The residuals of "twinSIR" and
"twinstim" models may be checked graphically by the new
function checkResidualProcess().
"twinstim"Modified arguments of twinstim(): new ordering, new
argument nCub.adaptive, removed argument
typeSpecificEndemicIntercept (which is now specified as
part of the endemic formula as
(1|type)).
Completely rewrote the R0-method (calculate
“trimmed” and “untrimmed” R_0 values)
The “trimmed” R0 values are now part of the result
of the model fit, as well as bbox(W). The model evaluation
environment is now set as attribute of the result if
model=TRUE.
New predefined spatial kernel: the Lomax power law kernel
siaf.lomax()
plot-methods for "twinstim"
(intensityplot() and iafplot())
as.epidataCS() now auto-generates the stop-column if
this is missing
print-method for class
"summary.epidataCS"
[- and subset-method for "epidataCS"
(subsetting ...$events)
plot-method for "epidataCS"
Improved documentation for the new functionalities.
Updated references.
twinSIR’s intensityPlot is now a method
of the new S3-generic function intensityplot.
"twinstim" and the "hhh4" model.
The "twinSIR" class of models has been migrated from
package RLadyBug to surveillance. It
may take a while before this version will become available from
CRAN.Renamed the "week" slot of the "sts" S4
class to "epoch". All saved data objects have accordingly
be renamed, but some hassle is to be expected if one you have old
"sts" objects stored in binary form. The function
convertSTS() can be used to convert such “old school”
"sts" objects.
Removed the functions algo.cdc() and
algo.rki().
Support for "twinSIR" models (with associated
"epidata" objects) as described in Höhle (2009) has been
moved from package RLadyBug to
surveillance. That means continuous-time discrete-space
SIR models.
Support for "twinstim" models as described in Meyer
et al (2012). That means continuous-time continuous-space infectious
disease models.
Added functionality for non-parametric back projection
(backprojNP()) and now-casting (nowcast())
based on "sts" objects.
Replaced the deprecated getSpPPolygonsLabptSlots()
calls by sp::coordinates() when plotting the map
slot.
Minor proof-reading of the documentation.
Added an argument "extraMSMargs" to the algo.hmm
function.
Fixed bug in outbreakP() when having observations
equal to zero in the beginning. Here, \(\hat{\mu}^{C1}\) in (5) of Frisen et al
(2008) is zero and hence the log-based summation in the code failed.
Changed to product as in the original code, which however might be less
numerically stable.
Fixed bug in stcd which added one to the calculated index of idxFA and idxCC. Thanks to Thais Rotsen Correa for pointing this out.
Added algo.outbreakP() (Frisen & Andersson,
2009) providing a semiparametric approach for outbreak detection for
Poisson distributed variables.
Added a pure R function for extracting ISO week and year from
Date objects. This function (isoWeekYear) is only called if
"%G" and "%V" format strings are used on
Windows (sessionInfo()[[1]]$os == "mingw32") as this is not
implemented for "format.Date" on Windows. Thanks to Ashley
Ford, University of Warwick, UK for identifying this Windows specific
bug.
For algo.farrington() a faster fit routine
"algo.farrington.fitGLM.fast" has been provided by Mikko
Virtanen, National Institute for Health and Welfare, Finland. The new
function calls glm.fit() directly, which gives a doubling
of speed for long series. However, if one wants to process the fitted
model output some of the GLM routines might not work on this output. For
backwards compatibility the argument
control$fitFun = "algo.farrington.fitGLM" provides the old
(and slow) behaviour.
A few minor bug fixes
Small improvements in the C-implementation of the
twins() function by Daniel Sabanés Bové fixing the
segmentation fault issue on 64-bit architectures.
Added the functions categoricalCUSUM and LRCUSUM.runlength for the CUSUM monitoring of general categorical time series (binomial, beta-binomial, multinomial, ordered response, Bradley-Terry models).
Added the functions pairedbinCUSUM and pairedbinCUSUM.runlength implementing the CUSUM monitoring and run-length computations for a paired binary outcome as described in Steiner et al. (1999).
Experimental implementation of the prospective space-time cluster detection described in Assuncao and Correa (2009).
Added a demo("biosurvbook") containing the code of
an upcoming book chapter on how to use the surveillance package. This
contains the description of ISO date use, negative binomial CUSUM,
run-length computation, etc. From an applicational point of view the
methods are illustrated by Danish mortality monitoring.
Fixed a small bug in algo.cdc found by Marian Talbert Allen which resulted in the control$m argument being ignored.
The constructor of the sts class now uses the argument
"epoch" instead of weeks to make clearer that also daily,
monthly or other data can be handled.
Added additional epochAsDate slot to sts class. Modified plot functions so they can handle ISO weeks.
algo.farrington now also computes quantile and median of the predictive distribution. Furthermore has the computation of reference values been modified so its a) a little bit faster and b) it is also able to handle ISO weeks now. The reference values for date t0 are calculated as follows: For i, i=1,…, b look at date t0 - i*year. From this date on move w months/weeks/days to the left and right. In case of weeks: For each of these determined time points go back in time to the closest Monday
Renamed the functions obsinyear to epochInYear, which now also handles objects of class Date.
Negative Binomial CUSUM or the more general NegBin likelihood ratio detector is now implemented as part of algo.glrnb. This includes the back calculation of the required number of cases before an alarm.
Time varying proportion binomial CUSUM.
Current status: Development version available from http://surveillance.r-forge.r-project.org/
Rewriting of the plot.sts.time.one function to use polygons
instead of lines for the number of observed cases. Due cause a number of
problems were fixed in the plotting of the legend. Plotting routine now
also handles binomial data, where the number of observed cases y are
stored in "observed" and the denominator data n are stored
in "populationFrac".
Problems with the aggregate function not operating correctly for the populationFrac were fixed.
The "rogerson" wrapper function for algo.rogerson
was modified so it now works better for distribution
"binomial". Thus a time varying binomial cusum can be run
by calling
rogerson( x, control(..., distribution="binomial"))
An experimental implementation of the twins model documented in Held, L., Hofmann, M., Höhle, M. and Schmid V. (2006). A two-component model for counts of infectious diseases, Biostatistics, 7, pp. 422–437 is now available as algo.twins.
The algo_glrpois function now has an additional
"ret" arguments, where one specifies the return type. The
arguments of the underlying c functions have been changed to include an
additional direction and return type value arguments.
added restart argument to the algo.glrpois control object, which allows the user to control what happens after the first alarm has been generated
experimental algo.glrnb function is added to the package. All calls to algo.glrpois are now just alpha=0 calls to this function. However, the underlying C functions differentiate between poisson and negative case