Latent Trait Models under IRT CRAN Task View: Multivariate (http://CRAN.R-project.org/view=Multivariate) CRAN Task View: Psychometrics (http://CRAN.R-project.org/view=Psychometrics) CRAN Task View: SocialSciences (http://CRAN.R-project.org/view=SocialSciences) Analysis of multivariate dichotomous and polytomous data using latent trait models under the Item Response Theory approach. It includes the Rasch, the Two-Parameter Logistic, the Birnbaum's Three-Parameter, the Graded Response, and the Generalized Partial Credit Models. Software Depends: R (>= 2.11.0), MASS, msm, mvtnorm, polycor Dimitris Rizopoulos <d.rizopoulos@erasmusmc.nl> Dimitris Rizopoulos <d.rizopoulos@erasmusmc.nl> GPL (>= 2) 2011-10-18 application/tgz http://CRAN.R-project.org/package=ltm