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Akour, Mutasem; Sabah, Saed; Hammouri, Hind – Journal of Psychoeducational Assessment, 2015
The purpose of this study was to apply two types of Differential Item Functioning (DIF), net and global DIF, as well as the framework of Differential Step Functioning (DSF) to real testing data to investigate measurement invariance related to test language. Data from the Program for International Student Assessment (PISA)-2006 polytomously scored…
Descriptors: Test Bias, Science Tests, Test Items, Scoring