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

Gordon Rae

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    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.
    LanguageEnglish
    Pages56-59
    JournalApplied Psychological Measurement
    Volume30
    Issue number1
    DOIs
    Publication statusPublished - Jan 2006

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    title = "Correcting coefficient alpha for correlated errors: Is alpha(K) a lower bound to reliability?",
    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.",
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    Correcting coefficient alpha for correlated errors: Is alpha(K) a lower bound to reliability? / Rae, Gordon.

    In: Applied Psychological Measurement, Vol. 30, No. 1, 01.2006, p. 56-59.

    Research output: Contribution to journalArticle

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