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McDonald's Omega

McDonald's omega is a factor-analysis-based reliability coefficient introduced by Roderick P. McDonald (1999) that quantifies the internal consistency of a composite score without requiring the restrictive assumption that all items contribute equally to the latent factor. It yields two complementary indices: ω_total, which captures overall reliability of the sum score, and ω_hierarchical (ωh), which reports how much of the composite's variance is explained specifically by a single general factor.

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McDonald's Omega Reliability Coefficient

Dossier de méthode taxonomique · latent-structure / psychometrics

McDonald, R. P. (1999). Test Theory: A Unified Treatment. Lawrence Erlbaum Associates. · ISBN 978-0805830750
Dunn, T. J., Baguley, T. & Brunsden, V. (2014). From alpha to omega: A practical solution to the pervasive problem of internal consistency estimation. British Journal of Psychology, 105(3), 399–412. · DOI 10.1111/bjop.12046

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Méthodes apparentées

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Same method familyCFAmachine-suggested · Relational suggestion, not evidence.Same method familyConfirmatory factor analysismachine-suggested · Relational suggestion, not evidence.Same method familyCronbach's Alphamachine-suggested · Relational suggestion, not evidence.Same method familyEFAmachine-suggested · Relational suggestion, not evidence.See alsoIntraclass Correlation Coefficientmachine-suggested · Relational suggestion, not evidence.Same method familyRasch Modelmachine-suggested · Relational suggestion, not evidence.