ltm: Latent Trait Models under IRT

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.

Version: 1.1-1
Depends: R (≥ 3.0.0), MASS, msm, polycor
Published: 2018-04-17
Author: Dimitris Rizopoulos
Maintainer: Dimitris Rizopoulos <d.rizopoulos at>
License: GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
NeedsCompilation: no
Citation: ltm citation info
Materials: NEWS
In views: MissingData, Multivariate, Psychometrics
CRAN checks: ltm results


Reference manual: ltm.pdf
Package source: ltm_1.1-1.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
OS X binaries: r-release: ltm_1.1-1.tgz, r-oldrel: ltm_1.1-1.tgz
Old sources: ltm archive

Reverse dependencies:

Reverse depends: catSurv, GPCMlasso, IMTest, infutil, integIRTy, irtoys, kequate, PCMRS, PerFit, QVM
Reverse imports: CTTShiny, difR, irtreliability, IRTShiny, missCompare, PsyControl, ShinyItemAnalysis
Reverse suggests: catIrt, equateIRT, equateMultiple, VARSEDIG


Please use the canonical form to link to this page.