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Baghaei, Purya; Aryadoust, Vahid – International Journal of Testing, 2015
Research shows that test method can exert a significant impact on test takers' performance and thereby contaminate test scores. We argue that common test method can exert the same effect as common stimuli and violate the conditional independence assumption of item response theory models because, in general, subsets of items which have a shared…
Descriptors: Test Format, Item Response Theory, Models, Test Items
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Aryadoust, Vahid – International Journal of Listening, 2012
This article investigates a version of the International English Language Testing System (IELTS) listening test for evidence of differential item functioning (DIF) based on gender, nationality, age, and degree of previous exposure to the test. Overall, the listening construct was found to be underrepresented, which is probably an important cause…
Descriptors: Evidence, Test Bias, Testing, Listening Comprehension Tests