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Comparison of IRT Observed-Score and True-Score 'Equatings' IRT

Author(s):
Lord, Frederic M.; Wingersky, Marilyn S.
Publication Year:
1983
Report Number:
RR-83-26-ONR
Source:
ETS Research Report
Document Type:
Report
Page Count:
21
Subject/Key Words:
Comparative Analysis, Equated Scores, Item Response Theory (IRT), Measurement Techniques, Scores, Statistical Analysis

Abstract

Two methods of "equating" tests using item response theory (IRT) are compared, one using true scores, the other using the estimated distribution of observed scores. On the data studied, they yield almost indistinguishable results. This is a reassuring result for users of IRT equating methods. (Author). (38pp.)

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