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Correcting coefficient alpha for correlated errors: Is alpha(K) a lower bound to reliability?

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Rae, Gordon (2006) Correcting coefficient alpha for correlated errors: Is alpha(K) a lower bound to reliability? APPLIED PSYCHOLOGICAL MEASUREMENT, 30 (1). pp. 56-59. [Journal article]

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DOI: 10.1177/0146621605280355

Abstract

When errors of measurement are positively correlated, coefficient alpha may overestimate the ``true'' reliability of a composite. To reduce this inflation bias, Komaroff (1997) has proposed an adjusted alpha coefficient, alpha(K). This article shows that alpha(K) is only guaranteed to be a lower bound to reliability if the latter does not include correlated error. If one's definition of reliability includes correlated error, then an alternative adjusted alpha, alpha(R), is suggested, which will always be a lower bound.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Psychology
Research Institutes and Groups:Psychology Research Institute
Psychology Research Institute > Health and Wellbeing
ID Code:1743
Deposited By:Mrs Fiona Harkin
Deposited On:23 Dec 2009 10:18
Last Modified:24 Feb 2014 10:44

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