Coefficients Alpha,Beta, Omega,and the glb: Comments on Sijtsma |
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| Authors: | William Revelle Richard E. Zinbarg |
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| Affiliation: | (1) Department of Psychology, Northwestern University, Evanston, IL, USA;(2) Department of Psychology, The Family Institute at Northwestern University, Northwestern University, Evanston, IL, USA |
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| Abstract: | There are three fundamental problems in Sijtsma (Psychometrika, 2008): (1) contrary to the name, the glb is not the greatest lower bound of reliability but rather is systematically less than ω t (McDonald, Test theory: A unified treatment, Erlbaum, Hillsdale, 1999), (2) we agree with Sijtsma that when considering how well a test measures one concept, α is not appropriate, but recommend ω t rather than the glb, and (3) the end user needs procedures that are readily available in open source software. |
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| Keywords: | reliability internal consistency homogeneity test theory coefficient alpha coefficient omega coefficient beta |
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