Estimating the Strength of a General Factor: Coefficient Omega Hierarchical

Gilles E. Gignac

Industrial and Organizational Psychology, 2015, vol. 8, issue 3, 434-438

Abstract: Relying on work described by Jackson (2003), Ree, Carretta, and Teachout (2015) recommended researchers use the first unrotated principal component associated with a principal components analysis (PCA) to estimate the strength of a general factor. Arguably, such a recommendation is based on rather old work. Furthermore, it is not a method that can be relied on to yield an accurate solution. For example, it is well known that the first component extracted from a correlation matrix of the Wechsler intelligence subtests is biased toward the verbal comprehension subtests (Ashton, Lee, & Vernon, 2001).

Date: 2015
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