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Real and Artificial Differential Item Functioning in Polytomous Items
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Andrich, David; Hagquist, Curt – Educational and Psychological Measurement, 2015
Differential item functioning (DIF) for an item between two groups is present if, for the same person location on a variable, persons from different groups have different expected values for their responses. Applying only to dichotomously scored items in the popular Mantel-Haenszel (MH) method for detecting DIF in which persons are classified by…
Descriptors: Test Bias, Test Items, Item Response Theory, Statistical Analysis