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

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 co...

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Bibliographic Details
Published inApplied psychological measurement Vol. 35; no. 7; pp. 495 - 517
Main Author Belov, Dmitry I.
Format Journal Article
LanguageEnglish
Published Los Angeles, CA SAGE Publications 01.10.2011
Subjects
Cheating
College Admission
College Students
Comparative Analysis
Computation
Evaluation Methods
High Stakes Tests
Identification
Item Response Theory
Monte Carlo Methods
Multiple Choice Tests
Poisson trials
Monte Carlo methods
hypothesis testing
K-Index
test security
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0146-6216
1552-3497
DOI:10.1177/0146621611420705