This package was removed from CRAN on 2026-03-20. Its history is shown below.

Reason: requires archived package 'glpkAPI'

Details below reflect version 2.1.2, its last release before removal.

xxIRT

2.1.2

Item Response Theory and Computer-Based Testing in R

0packages depend

2Kdownloads / year

–test coverage

–checks pass

Overview

About

Maintained by Xiao Luo8 releasesCRAN page ↗GitHub ↗

A suite of psychometric analysis tools for research and operation, including: (1) computation of probability, information, and likelihood for the 3PL, GPCM, and GRM; (2) parameter estimation using joint or marginal likelihood estimation method; (3) simulation of computerized adaptive testing using built-in or customized algorithms; (4) assembly and simulation of multistage testing. The full documentation and tutorials are at https://github.com/xluo11/xxIRT.

Install

R (source archive)pak (dev)Ubuntu (r2u)

url <- "https://cran.r-project.org/src/contrib/Archive/xxIRT/xxIRT_2.1.2.tar.gz"
pkgFile <- "xxIRT_2.1.2.tar.gz"
download.file(url, pkgFile)
install.packages(pkgFile, type = "source", repos = NULL)

This package is no longer on CRAN, so install.packages() cannot fetch it by name. This downloads the last archived source (2.1.2) and builds it locally. Install its dependencies first, and note that building from source needs the usual compiler toolchain.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("xluo11/xxIRT")

Development version from xluo11/xxIRT. 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-xxirt

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

Health

CRAN checks

CRAN check results are not tracked yet.

Code health

None

Tests · ratio 0.00

not tracked

Coverage

100%

Documentation · exports

Dependencies · direct

Check history

NOTE2026-03-10
0 OK · 14 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMENoVignettesNopkgdown siteNoNEWSNoCode of conductNoContributing guideNo

Examples that run: 67%
Documented parameters: 95%
Return-value docs: 7%
References docs: 0%

Downloads

CRAN downloads in the past year

Rank #24,502 · ~6/day · ~169/mo

Releases R versions

Daily download trend is not available in this view yet.

030 days

090 days

2K1 year

Compare downloads with other packages →

Also on85 r2u71 c2d4u

Dependencies

Declared dependencies

4 external dependencies (excludes base and recommended)

Depends (1)

R >= 3.5.0

Imports (5)

ggplot2 glpkAPI lpSolveAPI reshape2stats

LinkingTo (0)

none

Suggests (0)

none

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

–indirect (not tracked)

Nothing depends on this yet.

Code & Tests

Code Composition

R 3,691 (71%)Rd 1,534 (29%)

Code characteristics

Object systems

S38

Cyclomatic complexity: 3.0 median / 39 max

Test coverage

Line coverage

–

Expression

–

Tests / Examples

–

Functions

104 69 exported

Complexity

6.3 avg / 39 max

Call network

104 nodes / 159 edges

Test coverage has not been measured for this package yet; nodes fall back to a neutral fill.

Call graph

Open call graph →

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Lowest coverage

Per-function coverage is not measured for this package yet.

People & History

People (1)

Maintainer (1)

Xiao Luo

Author, Maintainer

Authors (1)

Xiao Luo

Author, Maintainer

Package Timeline

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

R
R 4.6.0 released · 2026-04-24
archivedRemoved from CRAN
2026-03-20
requires archived package 'glpkAPI'
R
R 4.5.0 released · 2025-04-11
R
R 4.4.0 released · 2024-04-24
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
R
R 4.0.0 released · 2020-04-24
R
R 3.6.0 released · 2019-04-26
2.1.2
2019-03-22 · diff ↗
2.1.1
2018-10-02 · diff ↗
2.1.0
2018-07-06 · diff ↗
R
R 3.5.0 released · 2018-04-23
2.0.3
2017-08-30 · diff ↗
R
R 3.4.0 released · 2017-04-21
2.0.1
2017-04-13 · diff ↗

Show 4 earlier events

2.0.0
2017-01-11 · diff ↗
1.1.0
2016-08-29 · diff ↗
1.0.1
2016-08-13
R
R 3.3.0 released · 2016-05-03

Package metadata

Total releases: 8
License: GPL (>= 3) OSI
Minimum R: ≥ 3.5.0
Download size: 45 KB
Installed size: not tracked yet
With dependencies: not tracked yet

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