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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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(p.167) Chapter 8 Reliability
Health Measurement Scales

David L. Streiner

Geoffrey R. Norman

Oxford University Press

Reliability is a basic requirement of scales, but it is frequently misunderstood. This chapter discusses what is meant by reliability; how it is defined conceptually and mathematically; why other terms, such as ‘accuracy’ and ‘precision’ are inadequate; and how it is assessed. Different types of reliability coefficients are presented, including Pearson's correlation, various forms of the intraclass correlation, and Cohen's kappa. The chapter also discusses the methods of reliability generalization.

Keywords:   kappa, intraclass correlation, ICC, reliability generalization

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