Provides tools for testing differential item functioning (DIF) and differential test functioning (DTF) in two-group item response theory models. The package estimates robust scaling parameters via iteratively reweighted least squares with Tukey's bisquare loss, and supports Wald-type tests of item-level and test-level differences from robust scaling parameters. Inputs can be supplied directly from model parameter/covariance objects or extracted from fitted 'mirt' and 'lavaan' models. Methods are described in Halpin (2022) <doi:10.48550/arXiv.2207.04598>.
| Version: | 0.2.0 |
| Depends: | R (≥ 3.5.0), Matrix |
| Imports: | mirt, lavaan |
| Suggests: | testthat (≥ 3.0.0) |
| Published: | 2026-04-21 |
| DOI: | 10.32614/CRAN.package.robustDIF |
| Author: | Peter Halpin [aut, cre], Kyle Nickodem [ctb], James Eagle [ctb] |
| Maintainer: | Peter Halpin <peter.halpin at unc.edu> |
| License: | GPL (≥ 3) |
| NeedsCompilation: | no |
| Materials: | README |
| CRAN checks: | robustDIF results |
| Reference manual: | robustDIF.html , robustDIF.pdf |
| Package source: | robustDIF_0.2.0.tar.gz |
| Windows binaries: | r-devel: robustDIF_0.2.0.zip, r-release: robustDIF_0.2.0.zip, r-oldrel: robustDIF_0.2.0.zip |
| macOS binaries: | r-release (arm64): robustDIF_0.2.0.tgz, r-oldrel (arm64): robustDIF_0.2.0.tgz, r-release (x86_64): robustDIF_0.2.0.tgz, r-oldrel (x86_64): robustDIF_0.2.0.tgz |
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