Statistical Properties of the K-Index for Detecting Answer Copying


Sotaridona, Leonardo S. and Meijer, Rob R. (2002) Statistical Properties of the K-Index for Detecting Answer Copying. Journal of Educational Measurement, 39 (2). pp. 115-132. ISSN 0022-0655

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Abstract:We investigated the statistical properties of the K-index (Holland, 1996) that can be used to detect copying behavior on a test. A simulation study was conducted to investigate the applicability of the K-index for small, medium, and large datasets. Furthermore, the Type I error rate and the detection rate of this index were compared with the copying index, o (Wollack, 1997). Several approximations were used to calculate the K-index. Results showed that all approximations were able to hold the Type I error rates below the nominal level. Results further showed that using o resulted in higher detection rates than the K-indices for small and medium sample sizes (100 and 500 simulees).
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Copyright:© 2002 Blackwell
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