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Download full textKubiak, Anna T.; Cowell, William R. – 1990
A procedure used to average several Mantel-Haenszel delta difference values for an item is described and evaluated. The differential item functioning (DIF) procedure used by the Educational Testing Service (ETS) is based on the Mantel-Haenszel statistical technique for studying matched groups. It is standard procedure at ETS to analyze test items…
Descriptors: Difficulty Level, Elementary Secondary Education, Equated Scores, Item Bias
