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.

Package details

AuthorIvailo Partchev [aut, cre], Gunter Maris [aut], Tamaki Hattori [ctb]
MaintainerIvailo Partchev <>
LicenseGPL (>= 2)
Package repositoryView on CRAN
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irtoys documentation built on May 2, 2019, 3:03 a.m.