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A Test-Theoretic Approach to Observed-Score Equating

Published online by Cambridge University Press:  01 January 2025

Wim J. van der Linden
Wim J. van der Linden*
Affiliation:
University of Twente
*
Requests for reprints should be sent to W.J. van der Linden, Department of Educational Measurement and Data Analysis, University of Twente, P.O. Box 217, 7500 AE Enschede, THE NETHERLANDS. E-Mail: w.j.vanderlinden@edte.utwente.nl
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Abstract

Observed-score equating using the marginal distributions of two tests is not necessarily the universally best approach it has been claimed to be. On the other hand, equating using the conditional distributions given the ability level of the examinee is theoretically ideal. Possible ways of dealing with the requirement of known ability are discussed, including such methods as conditional observed-score equating at point estimates or posterior expected conditional equating. The methods are generalized to the problem of observed-score equating with a multivariate ability structure underlying the scores.

Keywords

observed-score equatingequipercentile methodequating criteriamultidimensionality

Information

Type
Original Paper
Information
Psychometrika , Volume 65 , Issue 4 , December 2000, pp. 437 - 456
Copyright
Copyright © 2000 The Psychometric Society

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Footnotes

This article is based on the author's Presidential Address given on July 7, 2000 at the 65th Annual Meeting of the Psychometric Society held at the University of British Columbia, Vancouver, Canada.

The author is most indebted to Wim M.M. Tielen for his computational assistance and Cees A.W. Glas for his comments on a draft of this paper.

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