Package: irtQ
Type: Package
Title: Unidimensional Item Response Theory Modeling
Version: 1.0.0
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 (>= 4.3)
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") 
    ) 
RoxygenNote: 7.3.2
NeedsCompilation: no
Packaged: 2025-07-17 03:43:32 UTC; kijja
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>
Repository: CRAN
Date/Publication: 2025-07-17 04:00:02 UTC
Built: R 4.6.0; ; 2026-04-26 19:13:39 UTC; unix
