rasch: Models and Diagnostics for Rasch Measurement Theory

Fits models within Rasch Measurement Theory, whose defining properties include sufficiency and invariance (Rasch, 1960 <ISBN:9780226705538>; Andrich and Marais, 2019 <doi:10.1007/978-981-13-7496-8>). Models include the dichotomous Rasch, partial credit, rating scale, explanatory, many-facet and extended frame of reference models. Explanatory models include the linear logistic test model (Fischer, 1973 <doi:10.1016/0001-6918(73)90003-6>) and linear partial credit model (Fischer and Ponocny, 1994 <doi:10.1007/BF02295182>). Comparative judgement models, including explanatory object models, are available for dichotomous (Andrich, 1978 <doi:10.1177/014662167800200319>) and ordered pairwise responses (Tutz, 1986 <doi:10.1016/0022-2496(86)90034-9>). Item parameters for item-response models are estimated by pairwise conditional maximum likelihood (Zwinderman, 1995 <doi:10.1177/014662169501900406>), comparative judgement parameters by maximum likelihood, and person locations by weighted likelihood (Warm, 1989 <doi:10.1007/BF02294627>). Functions cover fit, targeting, reliability, dimensionality, local dependence, differential item functioning, equating and simulation. A 'shiny' application provides a graphical interface to the analyses.

Version:	1.12.0
Imports:	stats, graphics, grDevices, utils, parallel, Rcpp
LinkingTo:	Rcpp
Suggests:	testthat (≥ 3.0.0), shiny, bslib, DT, bsicons, htmltools, xml2, knitr, rmarkdown, eRm, sirt, psychotools, mirt, ShinyItemAnalysis, callr, WrightMap
Published:	2026-08-24
DOI:	10.32614/CRAN.package.rasch
Author:	Josh McGrane [aut, cre]
Maintainer:	Josh McGrane <drjoshmcgrane at gmail.com>
BugReports:	https://github.com/drjoshmcgrane/rasch/issues
License:	MIT + file LICENSE
URL:	https://drjoshmcgrane.github.io/rasch/, https://github.com/drjoshmcgrane/rasch
NeedsCompilation:	yes
Citation:	rasch citation info
Materials:	README, NEWS
CRAN checks:	rasch results

Documentation:

Reference manual:	rasch.html , rasch.pdf
Vignettes:	DIF with several person factors and repeated measures (source, R code) Explanatory Rasch models (source, R code) The Extended Frame of Reference model (source, R code) Many-facet Rasch measurement (source, R code) Rasch analysis of comparative judgements (source, R code) Simulation-based checks of Rasch diagnostics (source, R code) A Rasch analysis workflow (source, R code)

Downloads:

Package source:	rasch_1.12.0.tar.gz
Windows binaries:	r-devel: rasch_1.11.7.zip, r-release: rasch_1.11.7.zip, r-oldrel: rasch_1.11.7.zip
macOS binaries:	r-release (arm64): rasch_1.11.7.tgz, r-oldrel (arm64): rasch_1.11.7.tgz, r-release (x86_64): rasch_1.11.7.tgz, r-oldrel (x86_64): rasch_1.11.7.tgz
Old sources:	rasch archive

Linking:

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