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Taylor, Catherine S.; Lee, Yoonsun – Applied Measurement in Education, 2012
This was a study of differential item functioning (DIF) for grades 4, 7, and 10 reading and mathematics items from state criterion-referenced tests. The tests were composed of multiple-choice and constructed-response items. Gender DIF was investigated using POLYSIBTEST and a Rasch procedure. The Rasch procedure flagged more items for DIF than did…
Descriptors: Test Bias, Gender Differences, Reading Tests, Mathematics Tests
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Cho, Hyun-Jeong; Lee, Jaehoon; Kingston, Neal – Applied Measurement in Education, 2012
This study examined the validity of test accommodation in third-eighth graders using differential item functioning (DIF) and mixture IRT models. Two data sets were used for these analyses. With the first data set (N = 51,591) we examined whether item type (i.e., story, explanation, straightforward) or item features were associated with item…
Descriptors: Testing Accommodations, Test Bias, Item Response Theory, Validity