UMassAmherst: Research and Evaluation Methods

STDIF: Standardization-DIF analysis program
by Frédéric Robin

Robin, F. (2001). STDIF: Standardization-DIF analysis program [Computer program]. Amherst, MA: University of Massachusetts, Center for Educational Assessment. Retrieved [[date]], from

STDIF is a FORTRAN program, and can be downloaded here as an .exe with sample input and data files:

Documentation for the STDIF program is available here: STDIF User's Guide

The STDIF software was used in the following two studies, provided as a resource for researchers interested in applications of STDIF:


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