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van der Linden, Wim J.; Jeon, Minjeong – Journal of Educational and Behavioral Statistics, 2012
The probability of test takers changing answers upon review of their initial choices is modeled. The primary purpose of the model is to check erasures on answer sheets recorded by an optical scanner for numbers and patterns that may be indicative of irregular behavior, such as teachers or school administrators changing answer sheets after their…
Descriptors: Probability, Models, Test Items, Educational Testing
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van der Linden, Wim J. – Journal of Educational and Behavioral Statistics, 2009
A bivariate lognormal model for the distribution of the response times on a test by a pair of test takers is presented. As the model has parameters for the item effects on the response times, its correlation parameter automatically corrects for the spuriousness in the observed correlation between the response times of different test takers because…
Descriptors: Cheating, Models, Reaction Time, Correlation
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van der Linden, Wim J.; Guo, Fanmin – Psychometrika, 2008
In order to identify aberrant response-time patterns on educational and psychological tests, it is important to be able to separate the speed at which the test taker operates from the time the items require. A lognormal model for response times with this feature was used to derive a Bayesian procedure for detecting aberrant response times.…
Descriptors: Adaptive Testing, Bayesian Statistics, Reaction Time, College Entrance Examinations
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van der Linden, Wim J.; Sotaridona, Leonardo – Journal of Educational and Behavioral Statistics, 2006
A statistical test for detecting answer copying on multiple-choice items is presented. The test is based on the exact null distribution of the number of random matches between two test takers under the assumption that the response process follows a known response model. The null distribution can easily be generalized to the family of distributions…
Descriptors: Test Items, Multiple Choice Tests, Cheating, Responses
van der Linden, Wim J.; Sotaridona, Leonardo S. – 2002
A statistical test for the detection of answer copying on multiple-choice tests is presented. The test is based on the idea that answers of examinees to test items may be the results of three possible processes: (1) knowing; (2) guessing; and (3) copying. Examinees who do not have access to the answers of other examinees can arrive at their…
Descriptors: Cheating, Identification, Multiple Choice Tests, Statistical Analysis
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Sotaridona, Leonardo S.; van der Linden, Wim J.; Meijer, Rob R. – Applied Psychological Measurement, 2006
A statistical test for detecting answer copying on multiple-choice tests based on Cohen's kappa is proposed. The test is free of any assumptions on the response processes of the examinees suspected of copying and having served as the source, except for the usual assumption that these processes are probabilistic. Because the asymptotic null and…
Descriptors: Cheating, Test Items, Simulation, Statistical Analysis
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van der Linden, Wim J.; Sotaridona, Leonardo – Journal of Educational Measurement, 2004
A statistical test for the detection of answer copying on multiple-choice tests is presented. The test is based on the idea that the answers of examinees to test items may be the result of three possible processes: (1) knowing, (2) guessing, and (3) copying, but that examinees who do not have access to the answers of other examinees can arrive at…
Descriptors: Multiple Choice Tests, Test Items, Hypothesis Testing, Statistical Distributions