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The effect of *test characteristics on aberrant response patterns in computer adaptive testing

EFFECT OF TEST CHARACTERISTICS ON ABERRANT RESPONSE PATTERNS IN COMPUTER ADAPTIVE TESTING SEPTEMBER 2001 SABAM. RIZAVI, M S. COMPUTER SCIENCE DEPARTMENT OF PESHAWAR UNIVERSITY, PAKISTAN M.Ed., UNIVERSITY OF MASSACHUSETTS AMHERST Ed.D., UNIVERSITY OF MASSACHUSETTS AMHERST Directed by: Professor Hariharan Swaminathan The advantages that computer adaptive testing offers over linear tests have been well documented. The Computer Adaptive Test (CAT) design is more efficient than the Linear test design as fewer items are needed to estimate an examinee’s proficiency to a desired level of precision. In the ideal situation, a CAT will result in examinees answering different number of items according to the stopping rule employed. Unfortunately, the realities of testing conditions have necessitated the imposition of time and minimum test length limits on CATs. Such constraints might place a burden on the CAT test taker resulting in aberrant response behaviors by some examinees. Occurrence of such response patterns results in inaccurate estimation of examinee proficiency levels. This study examined the effects of test lengths, time limits and the interaction of these factors with the examinee proficiency levels on the occurrence of aberrant response patterns.