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Abstract Details

Activity Number: 453
Type: Topic Contributed
Date/Time: Wednesday, August 1, 2012 : 8:30 AM to 10:20 AM
Sponsor: Section on Government Statistics
Abstract - #304098
Title: Stolen Items, Copied Answers, and Fraudulent Erasures: How to Use Statistics to Detect Them
Author(s): Wim J. Van Der Linden*+
Companies: CTB/McGraw-Hill
Address: 20 Ryan Ranch Road, Monterey, CA, 93940, United States
Keywords: Cheating ; Educational Testing ; Response Model
Abstract:

A persistent problem in educational testing is cheating by examinees, teachers, and school administrators in the form of copied answers, shared test items, post hoc erasures of wrong answers, or electronic collusion. One of the tools of the testing industry to defend itself is forensic data analysis based on the response patterns by the examinees, erasures detected during optical scanning of the answer sheets, and response times recorded in computer-based testing. Key to the analysis is the use of a probabilistic model for the distribution of responses and response times on test items. A few response models in use in the testing industry will be reviewed, and then it will be shown how they can be used to formulate classical statistical tests as well as Bayesian checks on cheating.


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