A toolkit for detecting Differential Item Functioning (DIF) using Logistic Regression (LR) as described in Swaminathan and Rogers (1990) <doi:10.1111/j.1745-3984.1990.tb00754.x>, the IRT Likelihood Ratio Test (LRT) following Thissen, Steinberg & Wainer (1993, ISBN:0-8058-0972-4), and model-based recursive partitioning (MOB) as implemented in 'strucchange' following Strobl, Kopf and Zeileis (2015) <doi:10.1007/s11336-013-9388-3>. Designed for both standard two-group and intersectional multi-group designs, 'iDIFr' prioritises effect size reporting alongside statistical significance, clear guidance on group construction, and interpretable output suitable for applied testing contexts. Built-in Intersectional Contrast Analysis (ICA) classifies items as amplified, pure-intersection, obscured, or none by comparing single-variable and intersectional analyses.
| Version: | 1.0.1 |
| Depends: | R (≥ 4.1.0) |
| Imports: | Rcpp (≥ 1.0.0), generics, parallel, stats, cli, dplyr, ggplot2, rlang, strucchange |
| LinkingTo: | Rcpp |
| Suggests: | testthat (≥ 3.0.0), knitr, rmarkdown, openxlsx |
| Published: | 2026-06-08 |
| DOI: | 10.32614/CRAN.package.iDIFr (may not be active yet) |
| Author: | Thomas Rogers [aut, cre] |
| Maintainer: | Thomas Rogers <thomas.rogers at britishcouncil.org> |
| BugReports: | https://github.com/thmsrgrs/iDIFr/issues |
| License: | MIT + file LICENSE |
| URL: | https://github.com/thmsrgrs/iDIFr |
| NeedsCompilation: | yes |
| Materials: | README, NEWS |
| CRAN checks: | iDIFr results |
| Reference manual: | iDIFr.html , iDIFr.pdf |
| Vignettes: |
Getting started with iDIFr (source, R code) |
| Package source: | iDIFr_1.0.1.tar.gz |
| Windows binaries: | r-devel: not available, r-release: iDIFr_1.0.1.zip, r-oldrel: not available |
| macOS binaries: | r-release (arm64): iDIFr_1.0.1.tgz, r-oldrel (arm64): iDIFr_1.0.1.tgz, r-release (x86_64): iDIFr_1.0.1.tgz, r-oldrel (x86_64): iDIFr_1.0.1.tgz |
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