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Walker, Cindy M. – International Journal of Testing, 2001
Provides a tutorial on differential item functioning (DIF) and reviews DIFPACK, a new software package that is specifically designed to test for the presence of DIF. DIFPACK allows the user to test for standard unidirectional DIF, DIF in dichotomous items, DIF in polytomous items, and disordinal, or crossing, DIF. (SLD)
Descriptors: Computer Software, Identification, Item Bias, Test Items