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Direct linkWoods, Carol M. – Applied Psychological Measurement, 2009
Differential item functioning (DIF) occurs when items on a test or questionnaire have different measurement properties for one group of people versus another, irrespective of group-mean differences on the construct. Methods for testing DIF require matching members of different groups on an estimate of the construct. Preferably, the estimate is…
Descriptors: Test Results, Testing, Item Response Theory, Test Bias
