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EducationEducational AssessmentEducational MeasurementDifferential Item FunctioningMeasurement InvariancePsychometricsDifferential Test FunctioningItem AnalysisItem Characteristic CurvesItem ReviewPolytomous Item ModelsTestlet Differential Item FunctioningDichotomous Differential Item FunctioningDifferential Item Functioning ScreeningPolytomous Differential Item FunctioningPolytomous Item Differential FunctioningTest Performance Characteristics