Statistical properties of the K-index for detecting answer copying

R.R. Meijer, Leonardo Sotaridona

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Abstract

This study investigated statistical properties of the K-index (Holland, 1996) that can be used to detect copying behavior on tests. A simulation study was conducted to investigate the applicability of the K-index for small, medium, and large datasets. In addition, the Type I error rate and the detection rate of this index were compared with the copying index of J. Wollack (1997). Several approximations were used to calculate the K-index. Results show that all approximations were able to hold the Type I error rates below the nominal level. Results further show that using the copying index results in higher decision rates than the K-indices for small and medium sample sizes (100 and 500 simulees).
Original languageEnglish
Place of PublicationEnschede
PublisherUniversity of Twente, Faculty Educational Science and Technology
Number of pages29
Publication statusPublished - 2001

Publication series

NameOMD research report
PublisherUniversity of Twente, Faculty of Educational Science and Technology
No.01-06

Keywords

  • Sample Size
  • Statistical Analysis
  • METIS-205697
  • Simulation
  • Cheating
  • IR-104121

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  • Cite this

    Meijer, R. R., & Sotaridona, L. (2001). Statistical properties of the K-index for detecting answer copying. (OMD research report; No. 01-06). Enschede: University of Twente, Faculty Educational Science and Technology.