Construction of model matrices changed to re-use levels of factors while fitting for prediction. Thanks to Robert Poos for pointing the problem out.
Package mgcv of version at least 1.8-0 is required in order to avoid loading of the package for formula evaluation.
Examples changed to be less time consuming.
Bug fixed in ungroupPriors() and getPriors() to work with a grouping where only one unique value is contained. Thanks to Christine Koehler for pointing the problem out.
logLik() method for
"flexmix" objects now
also has a
In the M-step only the parameters of the previously fitted components are passed over to avoid nesting of environments. Thanks to Dominik Ernst for pointing the problem out.
boot() was fixed to work correctly with
grouped data if the groups are kept and if fixed effects are
Authors@R used in DESCRIPTION. Deepayan Sarkar listed as contributor due to internal code copied from package lattice used for the plots in flexmix.
FLXMRlmer() adapted for lme4 (>=
Parallel processing disabled in
Package dependencies, imports and suggests modified suitably for R >= 2.15.0.
NEWS file adapted to a NEWS.Rd file.
Parallel processing is enabled in
flexclust for details.
New model drivers
included which allow to fit finite mixtures of multinomial logit
and conditional logit models. Identifiability problems might arise
for this model class. Details on sufficient identifiability
conditions are given in Gruen and Leisch (2008).
A bug in
FLXMRlmm() was fixed which did not allow to specify
restrictions on the variances of the random effects and / or the
residuals. Thanks to Gregory Matthews for pointing the problem out.
The fit function in the M-step by default now is called with an
argument containing the fitted component. This allows to use the
parameter estimates from the previous step for initialization. Fit
functions which do not require this now need a
Thanks to Hannah Frick and Achim Zeileis for requesting this
initFlexmix() was added which is an alternative to
stepFlexmix() where first several short runs of EM, SEM or CEM are
performed followed by a long run of EM.
A bug fixed in
fitted() if a concomitant variable
model is specified and
aggregate = TRUE. Thanks to Julia Schiffner
for pointing this out.
A bug fixed in
FLXMRmgcv() if observations were removed in the
M-step because their a-posterior probabilities were smaller than
eps. Thanks to Ghislain Geniaux for pointing the problem out.
Vignettes moved from /inst/doc to /vignettes.
stepFlexmix() can now be called with a concomitant variable model
k starting with 1 without getting an error. The
concomitant variable model is internally replaced by
boot() method for
"flexmix" objects is extended to mixture
models with concomitant variables and mixtures of linear mixed
A bug fixed in the
summary() method for
"flexmix" objects. The
column post > 0 did not give the correct results if weights were
used for fitting the mixture.
A bug fixed in the
unique() method for
"stepFlexmix" objects. This
only occurred if components were dropped as well as if the EM
algorithm did not converge for all repetitions. Thanks to
Sebastian Meyer for pointing this out.
A bug fixed in
posterior(). Fixed priors were always used, also if
a concomitant variable model was present.
A method added for
prior() such that if newdata is supplied and
the object is of class
"flexmix" the prior class probabilities for
each observation are returned.
A generic method for
nobs() is introduced in stats4 for R
2.13.0. flexmix now does not define this generic function and
BIC() methods were modified to better exploit
already available methods. Thanks to Prof. Brian D. Ripley for
suggesting the modification.
A bug for
boot() fixed for
"flexmix" objects with an unbalanced
grouping variable. Thanks to Laszlo Sandor for pointing this out.
A bug for
rflexmix() fixed for
"flexmix" objects with a
concomitant variable model. Thanks to Greg Petroski for pointing
Functionality for bootstrapping finite mixture models added.
More generics and methods exported to use the
refit() method when
extending flexmix in other packages.
For long formulas
FLXMRglmfix() did not work properly due to the
splitting of the formula into several parts by
deparse(). This is
fixed by pasting them together again. Thanks to Dustin Tingley for
the bug report.
A new model driver
FLXMRmgcv() is added which allows to fit
regularized linear models in the components.
More generics and methods exported to allow extending flexmix in other packages.
The a-posteriori probabilities are now also determined as changed
FLXfit() for version 2.2-6 for
Bug fixed for FLXfillconcomitant and refit when weights and grouping are present. A check was added that weights are identical within groups.
group() is now exported.
Bug in the
FLXgetModelmatrix() method for the
fixed when determining identical random effects covariates for the
A new model driver for finite mixtures of linear mixed effects models with left-censored observations is added.
Determination of the a-posteriori probabilities made numerically more stable for small likelihoods. Thanks to Nicolas Picard for the code patch.
"FLXMRmstep" objects now returns similar output for
which = "concomitant" as for flexmix version 2.0-1.
New demo driver
FLXMCnorm1() for univariate Gaussian clustering.
Non-postive values for the maximum number of iterations for the
"FLXcontrol" object are not valid. A validity check for this is
"FLXMRfix" introduced which is a subclass
"FLXMR" and a superclass for
"FLXMRglmfix" which also
FLXMCfactanal() added which allows to
fit finite mixtures of Gaussian distributions where the
variance-covariance matrix is estimated using factor analyzers.
Comparison of formulas now done using
FLXMRlmm() added for fitting finite
mixtures of linear mixed effects models.
EIC() added as additional information criterion for assessing model fit.
Bug fixed in
plot() method for
"flexmix" objects introduced in version 2.2-3.
New model driver
FLXMCmvcombi() which is a combination of
Gaussian and binary.
parameters() now also has a which argument in order to allow to
access the parameters of the concomitant variable model.
Bug fixed in
nobs() now returns the number of rows in the data.frame and not the
number of individuals (similar as for example by lme).
vignette describing Version 2 added
all.equal()) replaced with
Bug fixed for prior in
relabel() to sort components (generic is in modeltools).
New example data generator
Fixed a bug in handling groups (gave an error for empty design matrices).
Added new model
FLXMRrobglm() for robust estimation of GLMs.
clusters() to avoid conflict with
from package survival
Bug fixed in internal functions using S4 generics and methods.
refit() now has a method argument. For method
variance-covariance matrix is determined using
optim() to maximize the
likelihood initialized in the solution found by the EM algorithm.
"mstep" refits the component specific and concomitant models
treating the posterior probabilities as given, i.e. performs an M-step
of the EM algorithm.
Lapply() added which allows to apply a function to each component
of a finite mixture
KLdiv() modified to allow for determination with a discrete and a
continuous version of the KL divergence
Model driver for zero-inflated component specific models.
Latent class analysis for binary multivariate data is now possible to estimate for truncated data where the number of observations with pattern only zeros is missing.
new argument newdata for
unique() method for
New class definitions for component specific models and concomitant variable models.
predict() now have an aggregate argument in order to
be able to determine the aggregated values over all components.
The package has now a vignette presenting several applications of finite mixtures of regression models with varying and fixed effects on artificial and real data which can be a accessed using the command vignette("regression-examples").
The vignette "flexmix-intro" was adapted to reflect the changes made in the package.
stepFlexmix() now returns an object of class
"stepFlexmix" which has
plot() method. In addition
getModel() can be used to
select an appropriate model.
flexmix() now has a weights argument for multiple identical
New model drivers for latent class analysis with Bernoulli and Poisson distributed multivariate observations.
Variants of the EM algorithm have been modified to correspond to
CEM and SEM. These names can now also be used for specifying the
classify slot of the
The package can now fit concomitant variable models.
New M-step driver for regression models with varying and fixed effects.
ICL information criterion added.
Fixed a bug that made the log-likelihood infinity for observations where all posteriors are numerically zero.
Fixed a bug for formulae with dots.
posterior() now has a newdata argument.
New demo driver for model-based clustering of binary data.
Adapted to changes in
summary.glm() of R version 2.3.0.
cluster argument of
flexmix() may now also be a matrix of
Fixed a bug to make size table work in case of empty clusters.
Fixed a bug in likelihood computation for grouped observations.
The artificial NPreg data now also have a binomial response,
added example to help(
FLXglm() driver now has an offset argument.
New data set seizure as example for a Poisson GLM with an offset.
fitted() can be used to extract fitted values from
New accessor methods
The package now uses lazy loading and has a namespace.
The package has now an introductionary vignette which can be
accessed using the command vignette("flexmix-intro"). The vignette
has been published in the Journal of Statistical Software, Volume
11, Issue 8 (http://www.jstatsoft.org/v11/i08), and the paper should be used as
citation for flexmix, run
citation("flexmix") in R 2.0.0 or newer
Several typos in help pages have been fixed.
Adjusted for R 2.0.0.
Fixed a bug in the
"flexmix" objects in case of empty clusters.
stepFlexmix() takes two new arguments:
compare allows fo find
minimum AIC/BIC solutions in addition to maximum likelihood,
verbose gives some information about progress.
Use a default of
verbose = 0 in
FLXcontrol() (better in combination
plot() methods for
"FLXglm" objects can now be automatically
refit()ted to get table of
significance tests for coefficients.
stepFlexmix() for more automated model search.
The artificial example data now have functions to
create them and a pre-stored data sets, new function
plot 2d Gaussians with confidence ellipses.
KLdiv() to compute Kullback-Leibler divergence of
The calculation of the degrees of freedom for
FLXmclust() was wrong
Fixed some codoc problems (missing aliases).
First version released on CRAN: 0.7-0