irtoys: A Collection of Functions Related to Item Response Theory (IRT)

A collection of functions useful in learning and practicing IRT, which can be combined into larger programs. Provides basic CTT analysis, a simple common interface to the estimation of item parameters in IRT models for binary responses with three different programs (ICL, BILOG-MG, and ltm), ability estimation (MLE, BME, EAP, WLE, plausible values), item and person fit statistics, scaling methods (MM, MS, Stocking-Lord, and the complete Hebaera method), and a rich array of parametric and non-parametric (kernel) plots. Estimates and plots Haberman's interaction model when all items are dichotomously scored.

Version: 0.2.2
Depends: sm, ltm
Suggests: MASS, knitr, rmarkdown
Published: 2022-05-12
DOI: 10.32614/CRAN.package.irtoys
Author: Ivailo Partchev [aut, cre], Gunter Maris [aut], Tamaki Hattori [ctb]
Maintainer: Ivailo Partchev <partchev at>
License: GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
NeedsCompilation: yes
Materials: NEWS
In views: Psychometrics
CRAN checks: irtoys results


Reference manual: irtoys.pdf
Vignettes: Round about irtoys


Package source: irtoys_0.2.2.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
macOS binaries: r-release (arm64): irtoys_0.2.2.tgz, r-oldrel (arm64): irtoys_0.2.2.tgz, r-release (x86_64): irtoys_0.2.2.tgz, r-oldrel (x86_64): irtoys_0.2.2.tgz
Old sources: irtoys archive

Reverse dependencies:

Reverse depends: subscore
Reverse imports: irtGUI, PerFit, PsyControl, shinyIRT
Reverse suggests: catIrt, PLmixed


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