iDIFr: Intersectional Differential Item Functioning Analysis
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 |
Documentation:
Downloads:
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