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Health Measurement ScalesA practical guide to their development and use$
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David L. Streiner and Geoffrey R. Norman

Print publication date: 2008

Print ISBN-13: 9780199231881

Published to Oxford Scholarship Online: September 2009

DOI: 10.1093/acprof:oso/9780199231881.001.0001

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Item response theory

Item response theory

Chapter:
(p.299) Chapter 12 Item response theory
Source:
Health Measurement Scales
Author(s):

David L. Streiner

Geoffrey R. Norman

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199231881.003.0012

Item response theory (IRT) is a relatively new approach to developing scales. It promises to produce scales that are shorter than those developed using traditional methods, but that are equally discriminating. With some models, the resulting scales have interval-scale properties. This chapter introduces the basic concepts and techniques of IRT, and discusses its advantages and limitations.

Keywords:   IRT, item response theory, scales, traditional methods, limitations

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