lordif: Logistic Ordinal Regression Differential Item Functioning using IRT
Seung W. Choi, Laura E. Gibbons, Paul K. Crane · 2009
Performs analysis of Differential Item Functioning (DIF) for dichotomous and polytomous items using an iterative hybrid of ordinal logistic regression and item response theory (IRT) according to Choi, Gibbons, and Crane (2011) .