Detection of Answer Copying Based on the Structure of a High-Stakes Test

Dmitry I. Belov

26 citations0/0 files storedApplied Psychological Measurement

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Psychometric Methodologies and Testing Academic integrity and plagiarism Benford’s Law and Fraud Detection

Abstract

This article presents the Variable Match Index (VM-Index), a new statistic for detecting answer copying. The power of the VM-Index relies on two-dimensional conditioning as well as the structure of the test. The asymptotic distribution of the VM-Index is analyzed by reduction to Poisson trials. A computational study comparing the VM-Index with the K-Index demonstrates that with the VM-Index, there is a large decrease in the Type II error rate and a smaller decrease in the Type I error rate.

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References

2012Applications of Item Response Theory To Practical Testing Problems 2010Distributions of the Kullback–Leibler divergence with applications 2008New trends in psychometrics 1997A Nominal Response Model Approach for Detecting Answer Copying 2000Detecting excessive similarity in answers on multiple choice exams 1996ASSESSING UNUSUAL AGREEMENT BETWEEN THE INCORRECT ANSWERS OF TWO EXAMINEES USING THE K‐INDEX: STATISTICAL THEORY AND EMPIRICAL SUPPORT 2002Statistical Properties of the K‐Index for Detecting Answer Copying 1993Crime in the classroom: Detection and prevention of cheating on multiple-choice exams

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