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Structurally consistent probabilities of selecting answers

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  • Nicolaus Tideman
  • Reza Kheirandish

Abstract

This paper offers a procedure for specifying probabilities for students to select answers on a multiple-choice test that, unlike previous procedures, satisfies all three of the following structural consistency conditions: (1) for any student, the sum over questions of the probabilities that the student will use the correct answers is the student's score on the test; (2) for any student, the sum over possible answers of the probabilities of using the answers is 1.0; and (3) for any answer to any question, the sum over students of the probabilities of using that answer is the number of students who used that answer. When applied to an exam, these fully consistent probabilities had the same power to identify cheaters as the probabilities proposed by Wesolowsky, and noticeably better power than the probabilities suggested by Frary et al.

Suggested Citation

  • Nicolaus Tideman & Reza Kheirandish, 2003. "Structurally consistent probabilities of selecting answers," Journal of Applied Statistics, Taylor & Francis Journals, vol. 30(7), pages 803-811.
    • Handle: RePEc:taf:japsta:v:30:y:2003:i:7:p:803-811
    DOI: 10.1080/0266476032000076065
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