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The Effect of Multidimensionality on IRT True-Score Equating for Subgroups of Examinees

André F. De Champlain
Journal of Educational Measurement
Vol. 33, No. 2 (Summer, 1996), pp. 181-201
Stable URL: http://www.jstor.org/stable/1435182
Page Count: 21
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The Effect of Multidimensionality on IRT True-Score Equating for Subgroups of Examinees
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Abstract

The purpose of this study was to assess the dimensionality of two forms of a large-scale standardized test separately for 3 ethnic groups of examinees and to investigate whether differences in their latent trait composites have any impact on unidimensional item response theory true-score equating functions. Specifically, separate equating functions for African American and Hispanic examinees were compared to those of a Caucasian group as well as the total test taker population. On both forms, a 2-dimensional model adequately accounted for the item responses of Caucasian and African American examinees, whereas a more complex model was required for the Hispanic subgroup. The differences between equating functions for the 3 ethnic groups and the total test taker population were small and tended to be located at the low end of the score scale.

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