Are Tests Comprising Both Multiple-Choice and Free-Response Items Necessarily Less Unidimensional Than Multiple-Choice Tests?An Analysis of Two Tests |
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| Authors: | David Thissen Howard Wainer Xiang-Bo Wang |
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| Institution: | University of North Carolina at Chapel Hill;Educational Testing Service;Law School Admission Services |
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| Abstract: | We consider the relationship between the multiple-choice and free-response sections on the Computer Science and Chemistry tests of the College Board's Advanced Placement program. Restricted factor analysis shows that the free-response sections measure the same underlying proficiency as the multiple-choice sections for the most part. However, there is also a significant, if relatively small, amount of local dependence among the free-response items that produces a small degree of multidimensionauty for each test |
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