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A Taxonomy of Item Response Models

Published online by Cambridge University Press:  01 January 2025

David Thissen*
Affiliation:
University of Kansas
Lynne Steinberg
Affiliation:
Educational Testing Service
*
Requests for reprints should be sent to David Thissen, Department of Psychology, University of Kansas, Lawrence, KS 66045.

Abstract

A number of models for categorical item response data have been proposed in recent years. The models appear to be quite different. However, they may usefully be organized as members of only three distinct classes, within which the models are distinguished only by assumptions and constraints on their parameters. “Difference models” are appropriate for ordered responses, “divide-by-total” models may be used for either ordered or nominal responses, and “left-side added” models are used for multiple-choice responses with guessing. The details of the taxonomy and the models are described in this paper.

Type
Original Paper
Copyright
Copyright © 1986 The Psychometric Society

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Footnotes

The present study was supported in part by two postdoctoral fellowships awarded to Lynne Steinberg: an Educational Testing Service Postdoctoral Fellowship at ETS, Princeton, NJ and an NIMH Individual National Research Service Award at Stanford University, Stanford, CA. Helpful comments by the editor and three anonymous reviewers are gratefully acknowledged.

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