ERIC Number: EJ829942
Record Type: Journal
Publication Date: 2009-Mar
Abstractor: As Provided
Reference Count: 0
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.
Springer. 233 Spring Street, New York, NY 10013. Tel: 800-777-4643; Tel: 212-460-1500; Fax: 212-348-4505; e-mail: email@example.com; Web site: http://www.springerlink.com
Publication Type: Journal Articles; Opinion Papers; Reports - Descriptive
Education Level: N/A
Authoring Institution: N/A