mirt

Overview

About

Maintained by Phil ChalmersFirst published 2011-07-0282 releasesCRAN page ↗GitHub ↗

Analysis of discrete response data using unidimensional and multidimensional item analysis models under the Item Response Theory paradigm (Chalmers (2012) doi:10.18637/jss.v048.i06). Exploratory and confirmatory item factor analysis models are estimated with quadrature (EM) or stochastic (MHRM) methods. Confirmatory bi-factor and two-tier models are available for modeling item testlets using dimension reduction EM algorithms, while multiple group analyses and mixed effects designs are included for detecting differential item, bundle, and test functioning, and for modeling item and person covariates. Finally, latent class models such as the DINA, DINO, multidimensional latent class, mixture IRT models, and zero-inflated response models are supported, as well as a wide family of probabilistic unfolding models.

Install

R (CRAN)pak (dev)Ubuntu (r2u)openSUSE (OBS)

install.packages("mirt", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("philchalmers/mirt")

Development version from philchalmers/mirt. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-mirt

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-mirt

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

5NOTE8OK

Failing flavors

NOTE r-devel-linux-x86_64-debian-clang
NOTE r-devel-linux-x86_64-debian-gcc
NOTE r-devel-linux-x86_64-fedora-clang
NOTE r-devel-linux-x86_64-fedora-gcc
NOTE r-devel-windows-x86_64

Slowest check: 9.5 min · r-devel-linux-x86_64-fedora-clang

Code health

Yes

Tests · ratio 0.07

0.0%

Coverage · measured lines

100%

Documentation · exports

16

Dependencies · direct

Check history

NOTE2026-07-16
11 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-05-02
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-25
11 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
NOTE2026-04-22
12 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-18
11 OK · 2 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE

Show 1 earlier snapshots

NOTE2026-03-10
12 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 507 wordsVignettesYes · dynamicpkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 27%
Documented parameters: 95%
Return-value docs: 34%
References docs: 88%

Downloads

134.2K

CRAN downloads in the past year

Rank #1,162 · ~368/day · ~11.2K/mo

Releases R versions

Daily download trend is not available in this view yet.

8.5K30 days

33.1K90 days

134.2K1 year

Compare downloads with other packages →

Also on1K r2u34 autocran8.4K conda_forge169 c2d4u

Repository

GitHub ↗ philchalmers/mirt

232Stars

86Forks

0Open issues

0Open PRs

30Releases

3,418Commits

19Contributors

irtmirtr

3,418 commits · Last activity 2026-07-18 · +0.4% stars, 30d

Stars over time

2025-07-16 · 2192026-07-07 · 232

Repository practices

Upstream repositoryBeta

3 development-tooling and community-health practices detected across 3 families in the upstream repository

Checks run against github.com/philchalmers/mirt on 2026-07-19.

Continuous integration (1)

GitHub Actions

Reproducibility and dev environment (1)

Makefile

Lint, format, editor (1)

RStudio project

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

23 external dependencies (excludes base and recommended)

Depends (5)

R >= 4.1.0statsstats4latticemethods

Imports (12)

GPArotation gridExtraMatrixRcppmgcvvegan Derivsplinessplines2 pbapply dcurver SimDesign

LinkingTo (2)

Rcpp RcppArmadillo

Suggests (14)

bootparallelmirai latticeExtra directlabels shiny knitr markdown Rsolnp nloptr sirt plink mirtCAT testthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

63direct

4indirect

and 15 more packages.

People & History

People (12)

Maintainer (1)

Phil Chalmers

Author, Maintainer

Authors (1)

Phil Chalmers

Author, Maintainer

Contributors (11)

Carl F. Falk

Contributor · added in 1.15

Samuel Huang

Contributor · added in 1.46.1

KwonHyun Kim

Contributor · added in 1.15

David King

Contributor · added in 1.26.1

Chen-Wei Liu

Contributor · added in 1.27.1

Adam Meade

Contributor · added in 1.17

Ogreden Oguzhan

Contributor · added in 1.28

Joshua Pritikin

Contributor · added in 3.0.2

Show 3 more contributors

Alexander Robitzsch

Contributor · added in 1.6.1

Lennart Schneider

Contributor · added in 1.26.1

Mateusz Zoltak

Contributor · added in 1.3

Package Timeline

82 releases. Pick two to compare their code metrics. R releases are shown for context.

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R 4.6.0 released · 2026-04-24
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R 2.13.0 released · 2011-04-13

Package metadata

First published: 2011-07-02
Total releases: 82 / 15 yrs
License: GPL (>= 3) OSI
Minimum R: ≥ 4.1.0
Bundled data: 11 KB / 9 files
Download size: 720 KB
Installed size: not tracked yet
With dependencies: not tracked yet

Appears in task views

Missing Data Psychometric Models and Methods