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Peer reviewedWollack, James A.; Cohen, Allan S. – Applied Psychological Measurement, 1998
Investigated empirical Type I error rates and the power of omega (index of answer copying developed by J. Wollack, 1997) when item and trait (theta) parameters were unknown and estimated from datasets of 100 and 500 examinees. Type I error was unaffected by estimating item parameters, with power slightly lower for the smaller sample. (SLD)
Descriptors: Cheating, Estimation (Mathematics), Plagiarism, Sample Size
Peer reviewedFrary, Robert B.; Tideman, T. Nicholaus – Educational and Psychological Measurement, 1997
Comparison of two indices of answer copying, one using only wrong responses and the other using right and wrong responses for six tests taken by from 910 to 1,154 college students suggests that indices of copying may perform differentially well according to the size of scores of examinee pairs evaluated. (SLD)
Descriptors: Cheating, College Students, Comparative Analysis, Higher Education
