Logistic Regression Differential Item Functioning using IRT CRAN Task View: Psychometrics (http://CRAN.R-project.org/view=Psychometrics) Analysis of Differential Item Functioning (DIF) for dichotomous and polytomous items using an iterative hybrid of (ordinal) logistic regression and item response theory (IRT) Software Depends: R (>= 2.7.0), MASS, msm, mvtnorm, polycor, sfsmisc, ltm, Hmisc, rms Seung W. Choi <s-choi@northwestern.edu> Seung W. Choi, with contributions from Laura E. Gibbons and Paul K. Crane GPL (>= 2) 2012-04-05 application/tgz http://CRAN.R-project.org/package=lordif