Package: difR
Type: Package
Title: Collection of Methods to Detect Dichotomous, Polytomous, and
        Continuous Differential Item Functioning (DIF)
Version: 6.1.0
Date: 2025-11-28
Authors@R: c(
    person("David", "Magis", role = "aut",
           comment = "IQVIA Belux"),
    person("Sebastien", "Beland", role = c("aut", "cre"),
           email = "sebastien.beland@umontreal.ca",
           comment = "Universite de Montreal"),
    person("Carl F.", "Falk", role = "aut",
           comment = "McGill University"),
    person("Gilles", "Raiche", role = "aut",
           comment = "UQAM"),
    person("Adela", "Hladka", role = "aut",
           comment = "Institute of Computer Science of the Czech Academy of Sciences (nee Drabinova)"),
    person("Josh", "Gilbert", role = "aut",
           email = "josh.b.gilbert@gmail.com",
           comment = "Harvard Graduate School of Education-Harvard University")
  )
Maintainer: Sebastien Beland <sebastien.beland@umontreal.ca>
Depends: R (>= 3.0.0)
Imports: mirt, ltm, lme4, deltaPlotR, DescTools, VGAM, glmnet, dplyr,
        tidyr, tibble, ggplot2
Description: Methods to detect differential item functioning (DIF) in dichotomous, polytomous, 
    and continuous items, using both classical and modern approaches. These include
    Mantel-Haenszel procedures, logistic regression (including ordinal models), and
    regularization-based methods such as LASSO. Uniform and non-uniform DIF effects
    can be detected, and some methods support multiple focal groups. The package
    also provides tools for anchor purification, rest score matching, effect size
    estimation, and DIF simulation. See Magis, Beland, Tuerlinckx, and De Boeck
    (2010, Behavior Research Methods, 42, 847–862, <doi:10.3758/BRM.42.3.847>) for
    a general overview.
License: GPL (>= 2)
Encoding: UTF-8
LazyData: true
RoxygenNote: 7.3.2
URL: https://github.com/343Babou/difR
BugReports: https://github.com/343Babou/difR/issues
NeedsCompilation: no
Packaged: 2025-11-29 00:56:26 UTC; sebastien
Author: David Magis [aut] (IQVIA Belux),
  Sebastien Beland [aut, cre] (Universite de Montreal),
  Carl F. Falk [aut] (McGill University),
  Gilles Raiche [aut] (UQAM),
  Adela Hladka [aut] (Institute of Computer Science of the Czech Academy
    of Sciences (nee Drabinova)),
  Josh Gilbert [aut] (Harvard Graduate School of Education-Harvard
    University)
Repository: CRAN
Date/Publication: 2025-11-29 06:10:41 UTC
Built: R 4.6.0; ; 2026-04-25 12:54:47 UTC; unix
