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| Porządkowa omega McDonalda× | Alfa Cronbacha (Analiza Rzetelności)× | |
|---|---|---|
| Dziedzina≠ | Psychometria | Statystyka |
| Rodzina | Latent structure | Latent structure |
| Rok powstania≠ | 2007 | 1951 |
| Twórca≠ | Bruno D. Zumbo, Anne M. Gadermann, and Cornelia Zeisser (building on McDonald's 1999 omega framework) | Lee J. Cronbach |
| Typ≠ | Reliability coefficient | Reliability / internal consistency coefficient |
| Źródło pierwotne≠ | Zumbo, B. D., Gadermann, A. M., & Zeisser, C. (2007). Ordinal versions of coefficients alpha and theta as measures of internal consistency for Likert rating scales. Journal of Modern Applied Statistical Methods, 6(1), 21–29. DOI ↗ | Cronbach, L. J. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16(3), 297–334. DOI ↗ |
| Inne nazwy | omega ordinal, ordinal omega, polychoric omega, omega for ordinal data | coefficient alpha, alpha reliability, internal consistency reliability, Güvenilirlik Analizi (Cronbach Alpha) |
| Pokrewne≠ | 3 | 4 |
| Podsumowanie≠ | Ordinal McDonald's omega is a reliability coefficient designed for Likert-type and other ordinal rating scales. Unlike Cronbach's alpha, it bases its calculation on polychoric correlations among items — capturing the true latent relationships between ordinal responses — and uses factor-analytic loadings to estimate how much of the composite score variance is attributable to a common factor. | Cronbach's alpha is a coefficient of internal consistency that quantifies the degree to which a set of items on a scale measures the same underlying construct. Introduced by Lee J. Cronbach in 1951, it remains the most widely reported reliability index in social-science, health, and educational research. |
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