IRT Equating Methods |
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| Authors: | Linda L Cook Daniel R Eignor |
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| Institution: | Executive Director of the Admissions and Guidance Programs Area in the College Board Division of Educational Testing Service (ETS), Princeton, NJ 08541.;Also at ETS, is Principal Measurement Specialist and Associate Director of Statistical Analysis in the College Board Division. (The authors' names appear in alphabetical order.) |
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| Abstract: | The purpose of this instructional module is to provide the basis for understanding the process of score equating through the use of item response theory (IRT). A context is provided for addressing the merits of IRT equating methods. The mechanics of IRT equating and the need to place parameter estimates from separate calibration runs on the same scale are discussed. Some procedures for placing parameter estimates on a common scale are presented. In addition, IRT true-score equating is discussed in some detail. A discussion of the practical advantages derived from IRT equating is offered at the end of the module. |
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