Package: irtQ
Type: Package
Title: Unidimensional Item Response Theory Modeling
Version: 1.2.0
Description: Fit unidimensional item response theory (IRT) models to
        test data, which includes both dichotomous and polytomous
        items, calibrate pretest item parameters, estimate examinees'
        abilities, and examine the IRT model-data fit on item-level in
        different ways as well as provide useful functions related to
        IRT analyses such as IRT model-data fit evaluation and
        differential item functioning analysis. The bring.flexmirt()
        and write.flexmirt() functions were written by modifying the
        read.flexmirt() function (Pritikin & Falk (2022)
        <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 (González (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>).
Depends: R (>= 4.4)
License: GPL (>= 2)
Encoding: UTF-8
LazyData: true
Imports: stats, statmod, utils, tibble, dplyr, purrr, tidyr, rlang,
        reshape2, janitor, ggplot2, gridExtra, parallel, Matrix, Rfast,
        mirt
Authors@R: c(person("Hwanggyu", "Lim", email="hglim83@gmail.com", role=c("aut", "cre")), 
    person("Craig S.", "Wells", email="cswells@educ.umass.edu", role="ctb"), 
    person("James", "Howard", email="jh@jameshoward.us", role="ctb"),
    person("Joshua", "Pritikin", email="jpritikin@pobox.com", role="ctb"), 
    person("Jonathan P", "Weeks", email="weeksjp@gmail.com", role="ctb"), 
    person("Jorge", "González", email="jgonzale@mat.puc.cl", role="ctb"), 
    person("David", "Magis", email="david.magis@uliege.be", role="ctb") 
    ) 
Suggests: knitr, rmarkdown, testthat (>= 3.0.0), pkgdown, RhpcBLASctl
Config/testthat/edition: 3
RoxygenNote: 7.3.2
Roxygen: list(markdown = TRUE)
URL: https://hwangQ.github.io/irtQ/, https://github.com/hwangQ/irtQ
BugReports: https://github.com/hwangQ/irtQ/issues
Config/pak/sysreqs: cmake make libicu-dev libuv1-dev libx11-dev
Repository: https://hwangq.r-universe.dev
Date/Publication: 2026-06-26 08:47:23 UTC
RemoteUrl: https://github.com/hwangq/irtq
RemoteRef: HEAD
RemoteSha: b87c2bd5f0cc623776415c6ebc42757deb2e3d5c
NeedsCompilation: no
Packaged: 2026-06-26 10:36:07 UTC; root
Author: Hwanggyu Lim [aut, cre],
  Craig S. Wells [ctb],
  James Howard [ctb],
  Joshua Pritikin [ctb],
  Jonathan P Weeks [ctb],
  Jorge González [ctb],
  David Magis [ctb]
Maintainer: Hwanggyu Lim <hglim83@gmail.com>