An Upper Asymptote for the Three-Parameter Logistic Item-Response Model.

Abstract

An upper-asymptote parameter was added to the three-parameter logistic item response model. This four-parameter model was compared to the three-parameter model on four data sets. The fourth parameter increased the likelihood in only two of the four sets. Ability estimates for the students were generally unchanged by the introduction of the fourth parameter. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1981
Accession Number
ADA103013

Entities

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  • Frederic M. Lord
  • Mark A. Barton

Organizations

  • Educational Testing Service

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  • Biomedical

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  • Air Force
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  • United States
  • Uss Carl Vinson

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  • Psychometric Testing or Psychological Assessment.
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