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First published on March 14, 2008
Applied Psychological Measurement 2008, doi:10.1177/0146621608314607
© 2008 SAGE Publications

Article

A Modified Frequency Estimation Equating Method for the Common-Item Nonequivalent Groups Design

Tianyou Wang* and Robert L. Brennan

* To whom correspondence should be addressed. E-mail: tianyou-wang{at}uiowa.edu.


  Abstract
Frequency estimation, also called poststratification, is an equating method used under the common-item nonequivalent groups design. A modified frequency estimation method is proposed here, based on altering one of the traditional assumptions in frequency estimation in order to correct for equating bias. A simulation study was carried out to compare equating errors for the modified frequency estimation method, the traditional frequency estimation method, and the chained equipercentile method. The results show that the modified frequency estimation method performs better than the traditional frequency estimation method and, under most circumstances, also performs better than the chained equipercentile method.


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