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**** CHANGES IN TAM PACKAGE VERSIONS ****
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Test Analysis Modules (TAM)
T. Kiefer, A. Robitzsch, & M. Wu
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mailto:
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Alexander Robitzsch
a.robitzsch@bifie.at
URL:
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For tutorials see
http://www.edmeasurementsurveys.com/TAM/Tutorials/
For development versions see
https://sites.google.com/site/alexanderrobitzsch/software
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Changes in Version 1.1 (2014-10-19)
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Features:
* added user defined variance function in tam.mml and
tam.mml.2pl
* added user defined constraints on slope parameters
in 'tam.mml.3pl'
Bug fixes:
* fixed a bug in deviance computation in 'tam.mml.3pl' when
stochastic nodes are used
* (hopefully) fixed computational problems in multidimensional models
with nearly singular covariance matrix
(thanks to a discussion with Johannes Hartig)
Notes:
* added a plot function 'plot.ctt' accompanying the classical test
theory based statistic
* fixed a bug in creation of design matrices in faceted models with
differing categories per item (thanks to Michal Modzelewski).
Note that the treatment of faceted models is still not compatible
with other software (like ConQuest). A substantial bug fix
is planned in future TAM relaeses.
Datasets included or modified:
* data.ctest1 (thanks to HGP)
Examples included or modified:
* tam.fit (4), tam.mml (17), tam.ctt (1)
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Changes in Version 1.0-3.18 (2014-09-08)
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Bug fixes:
x modified incorrectly calculated thresholds with 'tam.threshold'
for multidimensional models (reported by Janine Buchholz and
Jörg-Henrik Heine)
Notes:
x included SRMSR fit statistic in tam.modelfit
x included argument "Nsimul" in "tam.fit" which improves
calculation of fit statistics
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Changes in Version 1.0-3 (2014-06-27)
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Features:
x included model fit statistics (Q3, SRMR, MADRESIDCOV): 'tam.modelfit'
x included 'tam.mml.3pl' for 3PL estimation, general design
matrices for item slopes and options for discrete
latent variables (estimation of latent class models,
located latent class model, skew distributions,
mixed IRT models, cognitive diagnosis models, ...
is now possible)
x extended tam.pv for objects of class 'tam.mml.3pl'
x speeded data preparation of faceted models a bit
x tam.se now computes standard errors for estimated slope parameters, B
(for irtmodel in c("2PL", "GPCM", "2PL.groups")); highly experimental
for irtmodel="GPCM.design").
x plot.tam now prints a message about the location of the exported graphics.
x plot.tam has a new argument 'items' for selecting the items to
be displayed. RD-file adjusted.
x plot.tam has new arguments 'export.type="png"' and "export.args=list()" for
selecting the file type for the graphics export. The supported file types
are those supported by ?dev.new. The argument 'export.args=list()' is
for specifying a list of arguments for the export device method.
x tam.threshold has a new argument prob.lvl to set the probability level of
the thresholds.
Bug fixes:
x fixed a bug in pid output in object 'person' for multidimensional models
(thanks to Sebastian Weirich)
x fixed a bug in variance estimation for multiple group 2PL models
x included 'designMatrices.mfr2' for a provisional bug fix
for multifaceted models with differing number of categories
per item (see Example 16 in tam.mml; thanks to Christoph Duchhardt)
x fixed a bug in 'tam.mml.mfr' for differing number of categories
per item -> now a xsi vector with parameter fixings to values
of 99 is used
x plot.tam is debugged regarding the case of missing WLEs for some
person (thanks to Florian Buchwald).
x plot.tam now doesn't throw a warning when the 'Plots' directory
already exists.
x fixed a bug in plot.tam for cross-platform accordance (thanks to Uli Keller).
x fixed a bug in tam.fit with missing item scores
x fixed a bug in tam.jml so that ../Tutorials/6Population.htm now runs without
error.
Notes:
x tam.fit is experimental for objects obtained from tam.mml.mfr.
x changed convergence behavior in tam.wle (thanks to Peter Harych)
x changed item sorting in output object 'item'
x tam.mml(/.2pl/.mfr) methods now return Q, tam.mml.2pl additionaly returns
B.fixed, basispar, E, and est.slopegroups objects. RD-file adjusted.
x tam.jml(/.jml2) do not return fit statistics anymore. Item and person fit can
be obtained by a call to tam.fit (/.jml.fit).
x in case of multidimensional analyses, we recommend an update of
the R-package mvtnorm to version 0.9-99992 or higher.
x extended example 13 in tam.mml.Rd to the case of polytomous longitudinal
data (requested by and thanks to Florian Buchwald)
x extended example 6 in tam.mml.Rd to the specification of sum constraints
on the item parameters in a PCM model for differing number of categories.
x Some minor changes in RD-files (eg., irtmodel for argument 'E' in
tam.mml.2pl is "GPCM.design", theta value in tam.jml is "MLE in final step").
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Changes in Version 1.0-2 (2014-03-26)
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x fixed a Bug in the optional specification of a B matrix
in tam.mml.mfr
x new faster tam.mml.wle2; included Rcpp helper functions for
tam.mml.wle2 for fast computation; tam.mml.wle2 new
reference in tam.wle for objects of class tam.mml, rd-file
adapted
x tam.mml.mfr now accepts polytomous data with more than
ten categories per item
x specification of response matrix in 'long format' fixed,
see example section (thanks to Takuya Yanagida)
x some minor changes in usability (eg., pid can be specified as
vector, one-column matrix or data.frame)
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Changes in Versions 1.0 (2014-02-02)
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x updated DESCRIPTION and NAMESPACE due to changes in Rcpp
x change in package maintenance: now Thomas Kiefer is
the package maintainer
x fixed a bug in item labeling in tam.se
(thanks to Sebastian Weirich)
x fixed a bug in labeling of reduced reponse matrices in
tam.mml.mfr
x fixed some examples in .Rd files
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Changes in Versions 0.91/0.99 (2013-11-02)
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x added 'AXsi_' as value in tam.mml, tam.mml.2pl and tam.mml.mfr
x cleaned labels in 'tam.mml.mfr' for faceted models
x included the argument 'score.resp' in tam.wle for scoring
a new dataset different than the one which is used for item
calibration in tam (requested by Jan Böhnke)
x added examples for applying a sum constraint of item
parameters in 'tam.mml' (request by Kelvin Gregory)
x included argument 'adj' in tam.jml/tam.jml2 for modifying
the adjustment in case of perfect scores (thanks to Courtney Castle)
x included dataset 'data.timssAusTwn.scored'
x included summary for tam.jml
x use plausible values for calculation in item fit (in tam.mml.fit)
x included an example for creation of user-defined fit statistics
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Changes in Versions 0.9 (2013-10-13)
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x removed blanks in item category labels in tam.ctt2 and
tam.ctt3
x allowed non-integer group labels
x fixed a bug in data preparation for facet models
which appeared since a change in TAM 0.7
(thanks to Jonathan Williams)
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Changes in Versions 0.8 (2013-10-02)
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x changed rating scale parametrization for unequal
number categories per item
x included a warning in tam.ctt2 if memory allocation is
reached
x included deviance plot 'plotDevianceTAM'
(thanks to Sebastian Weirich)
x included tam.ctt3
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Changes in Versions 0.7 (2013-09-15)
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x include crossprod in some functions
x fixed a bug for using latent regression models in
facet model function 'tam.mml.mfr'
(thanks to Jonathan Williams)
x included another facet example (Example 14)
x fixed a bug in tam.mml.mfr if all facets possess
the same number of levels
x fixed a bug in multidimensional generalized partial
credit model estimation and speeded 2PL estimation a bit
x included bifactor model and exploratory factor analysis
-> function 'tam.fa' with arguments irtmodel='efa','bifactor'
x now printing progress in tam.ctt2 correctly
x fixed a bug in data processing in tam.mml.mfr for factor
or string input of facets
x included more examples in tam.fit, anova.tam.mml, tam.pv,
tam.jml, tam.se, tam.wle
x avoided inversion of singular matrices in multidimensional
WLE estimation tam.wle (thanks to Iasonas Lamprianou)
x removed bugs for item response datasets with only one item
in tam.mml and tam.mml.2pl
x fixed a bug in tam.ctt2: multiple groups were not displayed
x included an option for deleting redundant generalized items
which sometimes improves computation speed
x cleaned the TAM manual (thanks to Michaela Mayr)
x changed output structure of tam.fa and included rotation
examples in tam.fa.Rd
x included additional convergence stabilizing approach which
can be activated using the argument 'fac.oldxsi' in control
-> See Example 15 for such a non-converging model where
changing algorithmic defaults seems necessary
(problem addressed thanks to Sebastian Weirich)
x substituted internal 'theta.sq' function by Rcpp based
function 'theta.sq2'
x started with including examples similar to the ones in
the ConQuest 2.0 manual (see data.cqc.Rd)
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Changes in Versions 0.6 (2013-08-28)
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x fixed a bug when in latent regression when providing a formula
in argument 'formulaY'
x fixed a bug in output of tam.se (thanks to Sebastian Weirich)
x included a faster alternative to tam.ctt -> tam.ctt2 is based
on a Rcpp function
x allowed freeing beta constraints by the user by including
the possible argument beta.fixed=FALSE
x removed a bug in data processing for faceted designs
(thanks to Michaela Mayr)
x fixed a bug with varying string lengths of facet levels
x fixed a bug in tam.ctt2 for numeric input matrices
x fixed incorrect handling of constraints in regression coefficients
which was just included in a recent 0.6 version
x fixed an output bug in tam.wle in multidimensional models
(thanks to Jan Henning-Kahmann)
x accelerated estimation of multdimensional models (different
approach of calculating the prior distribution)
x fixed a bug when submitting xsi.inits and beta.inits to tam
x fixed a bug in facet models when a facet contains only one
element (twice thanks to Michaela Mayr)
x included irtmodel='PCM2' (partial credit model with ConQuest
parametrization) and irtmodel='RSM' (rating scale model)
x added a longitudinal data example in 'tam.mml' manual
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Changes in Versions 0.5 (2013-07-28)
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x included data.ex11 example dataset
x removed a bug in WLE calculation for multifaceted designs
x avoided warning in cov2cor for tam.mml.2pl function
(thanks to Linda Graefe)
x included argument increment.factor for obtaining
convergence behavior in bad suited data constellations
x changed default of np.adj in tam.pv to 8
x included two helper functions written in Rcpp in
plausible value imputation function tam.pv for
better performance
x included S3 plot method
x included data.numeracy and data.timssAusTwn
datasets
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Changes in Versions 0.4 (2013-07-01)
[*** First CRAN Release ***]
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x included quasi-Monte Carlo integration as an alternative
to stochastic integration
x multifaceted model completely implemented
x print warning if there are items in resp with only zeroes
(thanks to Ronny Scherer)
x fixed a bug in tam.wle, tam.pv and tam.se
x fixed a bug in creating design matrices for faceted designs
x changed initial xsi values for indetermined parameters
(thanks to Sebastian Weirich)
x included function for calculating Thurstonian thresholds
x included Rcpp function in M step for calculating item parameters
x fixed a bug for partial credit models
x included parametrization of the dispersion model for ordered data
x included a function tam.ctt for calculating some statistics
based on classical test theory
x fixed a bug in tam.mml.2pl with irtmodel="GPCM" for models
with differering numbers of item categories
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Changes in Versions 0.3 (2013-03-23)
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x cleaned Rd manual files a bit
x included standard errors in tam.mml and tam.mml.2pl
x included summary.tam and summary.tam.mml
x included anova.tam for model comparisons
x fixed a bug in multiple group estimation during tam.mml and
summary application
x fixed a bug in WLE estimation in the multdimensional case
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Changes in Versions 0.2 (2013-02-20)
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x removed bugs in tam.pv for sampling plausible values
with the argument normal.approx=FALSE
(thanks to Sebastian Weirich)
x included seed for stochastic integration in the tam
control argument
x fixed a bug in stochastic integration
(thanks to Steffen Brandt)
x fixed a bug in the calculation of reliability and person
parameter estimates when applying stochastic integration
(thanks to Steffen Brandt and Caroline Just)
x use estimated parameters with minimal deviance in the output
(thanks to Ulrich Schroeders and Steffen Brandt)
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Changes in Version 0.1-03 (2012-11-21)
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x 2PL calibration outsourced
x designMatrices and tam.mml.mfr method for multifacet rasch model
calibration included. Both highly experimental.
x Examples for the calibration included, see help file of sim.mfr