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Applying IRT Model to Determine Gender and Discipline-Based DIF and DDF: A Study of the IAU English Proficiency Test

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Sarallah Jafaripour; Omid Tabatabaei; Hadi Salehi; Hossein Vahid Dastjerdi – International Journal of Language Testing, 2024

The purpose of this study was to examine gender and discipline-based Differential Item Functioning (DIF) and Differential Distractor Functioning (DDF) on the Islamic Azad University English Proficiency Test (IAUEPT). The study evaluated DIF and DDF across genders and disciplines using the Rasch model. To conduct DIF and DDF analysis, the examinees…

Descriptors: Item Response Theory, Test Items, Language Tests, Language Proficiency