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ERIC Number: ED473529
Record Type: Non-Journal
Publication Date: 2002
Pages: 36
Abstractor: N/A
Reference Count: N/A
Some Alternatives to Sympson-Hetter Item-Exposure Control in Computerized Adaptive Testing. Research Report.
van der Linden, Wim J.
The Sympson and Hetter (SH; J. Sympson and R. Hetter; 1985; 1997) method is a method of probabilistic item exposure control in computerized adaptive testing. Setting its control parameters to admissible values requires an iterative process of computer simulations that has been found to be time consuming, particularly if the parameters have to be set conditional on a realistic set of values for the examinees ability parameter. Formal properties of the method are identified that help us explain why this iterative process can be slow and does not guarantee admissibility. In addition, some alternatives to the SH method are introduced. The behavior of these alternatives was estimated for an adaptive test from an item pool from the Law School Admission Test. Two of the alternatives showed attractive behavior and converged smoothly to admissibility for all items in a relatively small number of iteration steps. (Contains 4 figures and 14 references.) (Author/SLD)
Faculty of Educational Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. E-mail:
Publication Type: Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: Law School Admission Council, Princeton, NJ.
Authoring Institution: Twente Univ., Enschede (Netherlands). Faculty of Educational Science and Technology.
Identifiers - Assessments and Surveys: Law School Admission Test