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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- http://dx.doi.org/10.1002/j.2333-8504.1993.tb01539.x