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Coefficients Alpha, Beta, Omega, and the glb: Comments on Sijtsma
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 ωt (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 ωt rather than the glb, and (3) the end user needs procedures that are readily available in open source software.
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Citations
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“In brief, coefficient β indicates the proportion of variance in item scores that can be attributed to a common factor (Revelle & Zinbarg, 2008).”
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Metadata
- Authors
- Revelle, W., & Zinbarg, R. E.
- Venue
- Psychometrika
- Publisher
- Cambridge University Press (CUP)
- Published
- 2009-03
- Volume
- 74
- Issue
- 1
- Pages
- 145-154
- ISSN
- 0033-3123 (ISSN-L)
- 1860-0980
- OpenAlex
- W2027716222
- Cited by
- 1,628
- References
- 4
- FWCI
- 21.01
- Type
- journal article
- Language
- en
- Open access
- closed
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