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From alpha to omega: a practical solution to the pervasive problem of internal consistency estimation

Dunn, Thomas and Baguley, Thom and Brunsden, Vivienne (2013) From alpha to omega: a practical solution to the pervasive problem of internal consistency estimation. British Journal of Psychology, 105 (3). pp. 399-412. ISSN 0007-1269

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Official URL: http://dx.doi.org/10.1111/bjop.12046

Abstract

Coefficient alpha is the most popular measure of reliability (and certainly of internal consistency reliability) reported in psychological research. This is noteworthy given the numerous deficiencies of coefficient alpha documented in the psychometric literature. This mismatch between theory and practice appears to arise partly because users of psychological scales are unfamiliar with the psychometric literature on coefficient alpha and partly because alternatives to alpha are not widely known. We present a brief review of the psychometric literature on coefficient alpha, followed by a practical alternative in the form of coefficient omega. To facilitate the shift from alpha to omega, we also present a brief guide to the calculation of point and interval estimates of omega using a free, open source software environment.

Item Type: Article
Additional Information: Published by Wiley. All rights reserved. Reproduced in accordance with the publisher's self-archiving policy.
Uncontrolled Keywords: Coefficient alpha, Scale reliability, McDonald omega
Subjects: B Philosophy. Psychology. Religion > BF Psychology
H Social Sciences > HA Statistics
Q Science > Q Science (General)
Divisions: School of Social Science
Depositing User: Dr Thomas Dunn
Date Deposited: 10 Jun 2016 07:33
Last Modified: 06 Sep 2017 07:55
URI: http://researchonline.bishopg.ac.uk/id/eprint/48

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