Comment on 3PL IRT Adjustment for Guessing

Guessing behavior is an issue discussed widely with regard to multiple choice tests. Its primary effect is on number-correct scores for examinees at lower levels of proficiency. This is a systematic error or bias, which increases observed test scores. Guessing also can inflate random error variance....

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Bibliographic Details
Published in:Applied psychological measurement 2013-01, Vol.37 (1), p.76-86
Main Authors: Chiu, Ting-Wei, Camilli, Gregory
Format: Article
Language:English
Subjects:
Error of Measurement
Error Patterns
Guessing (Tests)
Indexing in process
Item Response Theory
Multiple Choice Tests
Scores
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Summary:Guessing behavior is an issue discussed widely with regard to multiple choice tests. Its primary effect is on number-correct scores for examinees at lower levels of proficiency. This is a systematic error or bias, which increases observed test scores. Guessing also can inflate random error variance. Correction or adjustment for guessing formulas has been applied to address some of these issues. The purpose of this research comment is to draw attention to the adjustment for guessing implicit in the three-parameter logistic item response theory model. Potential equity issues also arise with respect to this adjustment.
ISSN:0146-6216
1552-3497
DOI:10.1177/0146621612459369