Package: difR Type: Package Title: Collection of Methods to Detect Dichotomous and Polytomous Differential Item Functioning (DIF) Version: 6.0.0 Date: 2025-05-24 Authors@R: c(person("David", "Magis", role = c("aut"), comment = "IQVIA Belux"), person("Sebastien", "Beland", email = "sebastien.beland@umontreal.ca", role = c("aut", "cre"), comment = "Universite de Montreal"), person("Carl F.", "Falk", role = "aut", comment = "McGill University"), person("Gilles", "Raiche", role = "aut", comment = "UQAM")) Maintainer: Sebastien Beland Depends: R (>= 3.0.0) Imports: mirt, ltm, lme4, deltaPlotR, DescTools, VGAM, glmnet Description: Methods to detect differential item functioning (DIF) in dichotomous and polytomous 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, ) 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 Config/pak/sysreqs: cmake make libuv1-dev libssl-dev libx11-dev zlib1g-dev Repository: https://343babou.r-universe.dev Date/Publication: 2025-05-26 09:36:33 UTC RemoteUrl: https://github.com/343babou/difr RemoteRef: HEAD RemoteSha: a50aefa3ed396913b2909522b1cdd51b77754a03 NeedsCompilation: no Packaged: 2026-10-15 11:29:59 UTC; root Author: David Magis [aut] (IQVIA Belux), Sebastien Beland [aut, cre] (Universite de Montreal), Carl F. Falk [aut] (McGill University), Gilles Raiche [aut] (UQAM)