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

Thomas J. Dunn, Thom Baguley, Vivienne Brunsden

doi:10.1111/bjop.12046

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

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Thomas J. Dunn

Division of Psychology Nottingham Trent University UK
Thom Baguley

Division of Psychology Nottingham Trent University UK
Vivienne Brunsden

Division of Psychology Nottingham Trent University UK

書誌事項

公開日: 2013-08-06

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1111/bjop.12046

公開者: Wiley

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説明

<jats:p>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.</jats:p>