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ltm  

Latent Trait Models under IRT
View on CRAN: Click here


Download and install ltm package within the R console
Install from CRAN:
install.packages("ltm")

Install from Github:
library("remotes")
install_github("cran/ltm")

Install by package version:
library("remotes")
install_version("ltm", "1.2-0")



Attach the package and use:
library("ltm")
Maintained by
Dimitris Rizopoulos
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2005-03-14
Latest Update: 2022-02-18
Description:
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.
How to cite:
Dimitris Rizopoulos (2005). ltm: Latent Trait Models under IRT. R package version 1.2-0, https://cran.r-project.org/web/packages/ltm. Accessed 11 Aug. 2026.
Previous versions and publish date:
(2026-07-09 07:54), 0.1-0 (2005-03-14 10:35), 0.1-1 (2005-03-30 13:36), 0.2-1 (2005-05-09 09:49), 0.3-0 (2005-09-26 17:25), 0.3-1 (2005-11-28 10:05), 0.4-0 (2006-03-13 10:17), 0.4-1 (2006-04-03 09:46), 0.5-0 (2006-05-02 10:27), 0.5-1 (2006-06-12 10:00), 0.6-0 (2006-09-05 20:39), 0.6-1 (2006-10-03 09:42), 0.7-0 (2006-11-28 10:17), 0.7-1 (2007-02-11 13:41), 0.8-0 (2007-05-07 12:16), 0.8-1 (2007-07-16 22:06), 0.8-2 (2007-12-03 09:41), 0.8-3 (2008-03-03 15:47), 0.8-4 (2008-04-14 09:27), 0.8-5 (2008-06-09 20:13), 0.8-6 (2008-09-15 10:26), 0.8-7 (2008-11-17 12:04), 0.8-8 (2008-12-15 15:13), 0.8-9 (2009-01-08 11:59), 0.9-0 (2009-03-02 10:08), 0.9-1 (2009-06-19 09:31), 0.9-2 (2009-10-12 12:23), 0.9-3 (2009-12-09 09:53), 0.9-4 (2010-03-16 18:07), 0.9-5 (2010-09-30 07:42), 0.9-6 (2011-09-19 08:36), 0.9-7 (2011-10-18 12:50), 0.9-8 (2012-08-17 16:27), 0.9-9 (2012-09-17 08:47), 1.0-0 (2013-12-20 10:59), 1.1-0 (2017-09-11 13:50), 1.1-1 (2018-04-17 10:48)
Other packages that cited ltm R package
View ltm citation profile
Other R packages that ltm depends, imports, suggests or enhances
Complete documentation for ltm
Functions, R codes and Examples using the ltm R package
Some associated functions: Abortion . Environment . GoF . LSAT . Mobility . Science . WIRS . anova . biserial.cor . coef . cronbach.alpha . descript . factor.scores . fitted . gh . gpcm . grm . information . item.fit . ltm-package . ltm . margins . mult.choice . person.fit . plot.descript . plot.fscores . plot . rasch . rcor.test . residuals . rmvlogis . summary . testEquatingData . tpm . unidimTest . vcov . 
Some associated R codes: EM.R . GHpoints.R . GoF.gpcm.R . GoF.rasch.R . IRT.parm.R . IRT.parm.grm.R . IRT.parm.ltm.R . IRT.parm.rasch.R . IRT.parm.tpm.R . anova.gpcm.R . anova.grm.R . anova.ltm.R . anova.rasch.R . anova.tpm.R . betas.gpcm.R . betas.grm.R . betas.ltm.R . betas.rasch.R . betas.rasch2.R . biserial.cor.R . cd.tpm.R . cd.vec.R . chisq.irt.R . coef.gpcm.R . coef.grm.R . coef.ltm.R . coef.rasch.R . coef.tpm.R . cprobs.R . crf.GPCM.R . crf.GPCM2.R . cronbach.alpha.R . cumprobs.R . descript.R . factor.scores.R . factor.scores.gpcm.R . factor.scores.grm.R . factor.scores.ltm.R . factor.scores.rasch.R . factor.scores.tpm.R . fd.vec.R . fitted.gpcm.R . fitted.grm.R . fitted.ltm.R . fitted.rasch.R . fitted.tpm.R . fscores.g.R . fscores.gp.R . fscores.l.R . fscores.r.R . fscores.t.R . gauher.R . globals.R . gpcm.R . grm.R . infoGPCM.R . infoprobs.R . information.R . iprobs.R . item.fit.R . jacobian.R . linpred.GPCM.R . logLik.gpcm.R . logLik.grm.R . logLik.ltm.R . logLik.rasch.R . logLik.tpm.R . logLiktpm.R . loglikgpcm.R . loglikgrm.R . loglikltm.R . ltm.R . ltm.fit.R . margins.R . margins.gpcm.R . margins.grm.R . margins.ltm.R . margins.rasch.R . margins.tpm.R . matArrays.R . matMeans.R . matSums.R . matches.R . mult.choice.R . observedFreqs.R . person.fit.R . plot.aov.gpcm.R . plot.descript.R . plot.fscores.R . plot.gpcm.R . plot.grm.R . plot.ltm.R . plot.rasch.R . plot.tpm.R . plot.unidimTest.R . print.GoF.gpcm.R . print.GoF.rasch.R . print.aov.gpcm.R . print.aov.grm.R . print.aov.ltm.R . print.aov.rasch.R . print.aov.tpm.R . print.cronbachAlpha.R . print.descript.R . print.fscores.R . print.gpcm.R . print.grm.R . print.information.R . print.itemFit.R . print.ltm.R . print.margins.gpcm.R . print.margins.grm.R . print.margins.ltm.R . print.persFit.R . print.rasch.R . print.rcor.test.R . print.summ.gpcm.R . print.summ.grm.R . print.summ.ltm.R . print.summ.rasch.R . print.summ.tpm.R . print.tpm.R . print.unidimTest.R . probs.R . rasch.R . rcor.test.R . residuals.gpcm.R . residuals.grm.R . residuals.ltm.R . residuals.rasch.R . residuals.tpm.R . rmvlogis.R . rmvordlogis.R . scoregpcm.R . scoregpcmSNW.R . scoregrm.R . scoreltm.R . scoretpm.R . simulate.gpcm.R . simulate.grm.R . start.val.gpcm.R . start.val.grm.R . start.val.ltm.R . start.val.rasch.R . start.val.tpm.R . summary.gpcm.R . summary.grm.R . summary.ltm.R . summary.rasch.R . summary.tpm.R . testEquatingData.R . thetas.tpm.R . tpm.R . unidimTest.R . vcov.gpcm.R . vcov.grm.R . vcov.ltm.R . vcov.rasch.R . vcov.tpm.R .  Full ltm package functions and examples
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