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ERIC Number: EJ829942
Record Type: Journal
Publication Date: 2009-Mar
Pages: 10
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0033-3123
Coefficients Alpha, Beta, Omega, and the glb: Comments on Sijtsma
Revelle, William; Zinbarg, Richard E.
Psychometrika, v74 n1 p145-154 Mar 2009
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 omega[subscript 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, alpha is not appropriate, but recommend omega[subscript t] rather than the glb, and (3) the end user needs procedures that are readily available in open source software.
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Publication Type: Journal Articles; Opinion Papers; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A