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How Unidimensional Are Tests Comprising Both Multiple-Choice and Free-Response Items? An Analysis of Two Tests AP

Author(s):
Thissen, David; Wainer, Howard; Wang, Xiang-Bo
Publication Year:
1993
Report Number:
RR-93-28
Source:
ETS Research Report
Document Type:
Report
Page Count:
15
Subject/Key Words:
Advanced Placement Program (AP), Factor Analysis, Free-Response Tests, Multiple-Choice Tests, Unidimensionality (Tests)

Abstract

(15pp.) 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. Confirmatory factor analy- sis 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 multidimensionality for each test.

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