irtQ: Unidimensional Item Response Theory Modeling
Fits unidimensional item response theory (IRT) models to test
data that include dichotomous and polytomous items, calibrates pretest
items with fixed item and fixed ability parameter calibration, performs
multiple-group calibration, estimates the abilities of examinees, and
evaluates model-data fit at the item level. It also provides tools for
detecting differential item functioning and item parameter drift, for
computing classification accuracy and consistency, and for evaluating and
simulating multistage-adaptive test panels, together with classical test
theory functions for item- and test-level statistics (e.g., item difficulty,
item-total correlation, and coefficient alpha) and for scoring
selected-response item data.
The bring.flexmirt() and write.flexmirt() functions were written by modifying
the read.flexmirt() function (Pritikin & Falk (2020) <doi:10.1177/0146621620929431>).
The bring.bilog() and bring.parscale() functions were written by modifying the read.bilog()
and read.parscale() functions, respectively (Weeks (2010) <doi:10.18637/jss.v035.i12>).
The bisection() function was written by modifying the bisection() function
(Howard (2017, ISBN:9780367657918)). The code of the inverse test characteristic curve
scoring in the est_score() function was written by modifying the irt.eq.tse() function
(Gonzalez (2014) <doi:10.18637/jss.v059.i07>). In est_score() function, the code of weighted
likelihood estimation method was written by referring to the Pi(), Ji(), and Ii() functions
of the 'catR' package (Magis & Barrada (2017) <doi:10.18637/jss.v076.c01>).
| Version: |
1.4.0 |
| Depends: |
R (≥ 4.5) |
| Imports: |
stats, statmod, utils, tibble, dplyr, purrr, tidyr, rlang, reshape2, janitor, ggplot2, gridExtra, parallel, Matrix, Rfast |
| Suggests: |
knitr, rmarkdown, testthat (≥ 3.0.0), pkgdown, RhpcBLASctl, mirt |
| Published: |
2026-11-14 |
| DOI: |
10.32614/CRAN.package.irtQ |
| Author: |
Hwanggyu Lim [aut, cre],
Craig S. Wells [ctb],
James Howard [ctb],
Joshua Pritikin [ctb],
Jonathan P Weeks [ctb],
Jorge Gonzalez [ctb],
David Magis [ctb] |
| Maintainer: |
Hwanggyu Lim <hglim83 at gmail.com> |
| BugReports: |
https://github.com/hwangQ/irtQ/issues |
| License: |
GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| URL: |
https://hwangQ.github.io/irtQ/, https://github.com/hwangQ/irtQ |
| NeedsCompilation: |
no |
| Materials: |
README, NEWS |
| CRAN checks: |
irtQ results |
Documentation:
Downloads:
Reverse dependencies:
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