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.
Versions across snapshots
| Version | Repository | File | Size |
|---|---|---|---|
1.0.1 |
rolling linux/jammy R-4.5 | iDIFr_1.0.1.tar.gz |
261.6 KiB |
1.0.1 |
rolling linux/noble R-4.5 | iDIFr_1.0.1.tar.gz |
262.8 KiB |
1.0.1 |
rolling source/ R- | iDIFr_1.0.1.tar.gz |
72.4 KiB |
1.0.1 |
latest linux/jammy R-4.5 | iDIFr_1.0.1.tar.gz |
261.6 KiB |
1.0.1 |
latest linux/noble R-4.5 | iDIFr_1.0.1.tar.gz |
262.8 KiB |
1.0.1 |
latest source/ R- | iDIFr_1.0.1.tar.gz |
72.4 KiB |
1.0.1 |
2026-04-23 source/ R- | iDIFr_1.0.1.tar.gz |
0 B |