A Comparison of the Frequency Estimation and Chained Equipercentile Methods Under the Common-Item Nonequivalent Groups Design  

Oleh:

Tianyou, Wang ; Won-Chan, Lee ; Brennan, Robert L. ; Kolen, Michael J.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Applied Psychological Measurement vol. 32 no. 8 (Nov. 2008), page 632-651.
Topik: test equating; frequency estimation method; chained equipercentile method; common-itemnonequivalent groups design; standard errors of equating; equating bias; item response theory
Fulltext: 632.pdf (604.0KB)

Isi artikel

This article uses simulation to compare two test equating methods under the common-item nonequivalent groups design: the frequency estimation method and the chained equipercentile method. An itemresponse theorymodel is used to define the true equating criterion, simulate group differences, and generate response data. Three linear equatingmethods are also included for reference. The results show that when there is substantial group difference, the frequency estimationmethod has larger bias than the chained equipercentilemethod. The frequency estimationmethod, however, almost always has a smaller standard error of equating than the chained equipercentile method.

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