eRm

1.0-10

Extended Rasch Modeling

14packages depend

36.8Kdownloads / year

–test coverage

13/13checks pass

Overview

About

Maintained by Patrick MairFirst published 2006-09-1327 releasesCRAN page ↗

Fits Rasch models (RM), linear logistic test models (LLTM), rating scale model (RSM), linear rating scale models (LRSM), partial credit models (PCM), and linear partial credit models (LPCM). Missing values are allowed in the data matrix. Additional features are the ML estimation of the person parameters, Andersen's LR-test, item-specific Wald test, Martin-Loef-Test, nonparametric Monte-Carlo Tests, itemfit and personfit statistics including infit and outfit measures, ICC and other plots, automated stepwise item elimination, simulation module for various binary data matrices.

Install

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

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

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

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-erm

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-eRm

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

Health

CRAN checks

13OK

Slowest check: 4.9 min · r-devel-linux-x86_64-fedora-clang

Check history

OK2026-06-27
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
WARNING2026-06-14
12 OK · 0 NOTE · 1 WARNING · 0 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

Documentation signals are not tracked yet for this package.

Downloads

36.8K

CRAN downloads in the past year

Rank #2,782 · ~101/day · ~3.1K/mo

eRm Releases R versions

Daily download trend is not available in this view yet.

1.8K30 days

6.4K90 days

36.8K1 year

Compare downloads with other packages →

Also on511 r2u36 autocran100 c2d4u

Dependencies

Declared dependencies

2 external dependencies (excludes base and recommended)

Depends (1)

R >= 3.5.0

Imports (10)

graphicsgrDevicesstatsmethodsMASSsplinesMatrixlatticecolorspace psych

LinkingTo (0)

none

Suggests (0)

none

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

14direct

0indirect

iarm exhaustiveRasch mstDIF tcl whomds GMX PP RMX easyRasch2 easyRaschBayes lvmPlot mfrmr pwrRasch tmt

Code & Tests

Datasets

People & History

People (5)

Maintainer (1)

Patrick Mair

Maintainer, Author

Authors (4)

Maintainer, Author

Author

Author

Author · added in 0.15-5

Contributors (1)

Rudolf Debelak

Contributor · added in 1.0-0

Listed in earlier versions (1)

Maier

no longer listed · 0.15-1 to 1.0-10

Package Timeline

27 releases. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
1.0-10Latest
2025-05-28 · current release · diff ↗
R
R 4.5.0 released · 2025-04-11
1.0-9
2025-03-25 · diff ↗
R
R 4.4.0 released · 2024-04-24
1.0-6
2024-03-15 · diff ↗
1.0-5
2024-03-01 · diff ↗
1.0-4
2023-09-28 · diff ↗
R
R 4.3.0 released · 2023-04-21
R
R 4.2.0 released · 2022-04-22
R
R 4.1.0 released · 2021-05-18
1.0-2
2021-02-15 · diff ↗
R
R 4.0.0 released · 2020-04-24
1.0-1
2020-03-03 · diff ↗
1.0-0
2019-06-06 · diff ↗
R
R 3.6.0 released · 2019-04-26

Show 38 earlier events

0.16-2
2018-10-03 · diff ↗
0.16-1
2018-05-26 · diff ↗
R
R 3.5.0 released · 2018-04-23
0.16-0
2018-03-11 · diff ↗
R
R 3.4.0 released · 2017-04-21
0.15-7
2016-11-20 · diff ↗
R
R 3.3.0 released · 2016-05-03
0.15-6
2015-11-12 · diff ↗
R
R 3.2.0 released · 2015-04-16
0.15-5
2015-01-10 · diff ↗
R
R 3.1.0 released · 2014-04-10
0.15-4
2014-02-05 · diff ↗
0.15-3
2013-12-07 · diff ↗
R
R 3.0.0 released · 2013-04-03
0.15-1
2012-11-11 · diff ↗
R
R 2.15.0 released · 2012-03-30
R
R 2.14.0 released · 2011-10-31
R
R 2.13.0 released · 2011-04-13
R
R 2.12.0 released · 2010-10-15
R
R 2.11.0 released · 2010-04-22
R
R 2.10.0 released · 2009-10-26
R
R 2.9.0 released · 2009-04-17
R
R 2.8.0 released · 2008-10-20
R
R 2.7.0 released · 2008-04-22
0.9-5
2007-10-24 · diff ↗
0.9-4
2007-10-17 · diff ↗
R
R 2.6.0 released · 2007-10-03
0.9-3
2007-09-25 · diff ↗
0.9-2
2007-09-01 · diff ↗
0.9.1.1
2007-05-23 · diff ↗
0.9.1
2007-05-18 · diff ↗
0.9.0
2007-04-26 · diff ↗
R
R 2.5.0 released · 2007-04-24
0.3.2
2006-10-18 · diff ↗
0.3.1
2006-10-15 · diff ↗
R
R 2.4.0 released · 2006-10-03
0.3
2006-09-13
R
R 2.3.0 released · 2006-04-24

Package metadata

First published: 2006-09-13
Total releases: 27 / 20 yrs
License: GPL-3 OSI
Download size: 742 KB
Installed size: not tracked yet
With dependencies: not tracked yet

Appears in task views

Missing Data Psychometric Models and Methods

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