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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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 Psychology
|Deposited By:||Mrs Fiona Harkin|
|Deposited On:||23 Dec 2009 10:18|
|Last Modified:||23 Dec 2009 10:18|
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