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Statistical Properties of the K ‐Index for Detecting Answer Copying
Author(s) -
Sotaridona Leonardo S.,
Meijer Rob R.
Publication year - 2002
Publication title -
journal of educational measurement
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.917
H-Index - 47
eISSN - 1745-3984
pISSN - 0022-0655
DOI - 10.1111/j.1745-3984.2002.tb01138.x
Subject(s) - copying , index (typography) , statistics , type i and type ii errors , mathematics , statistical analysis , statistical hypothesis testing , statistical error , computer science , world wide web , political science , law
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, ω (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 ω resulted in higher detection rates than the K‐indices for small and medium sample sizes (100 and 500 simulees).