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Focus on Psychometrics. Coefficient alpha: Conceptualizations and anomalies
Author(s) -
Knapp Thomas R.
Publication year - 1991
Publication title -
research in nursing and health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 85
eISSN - 1098-240X
pISSN - 0160-6891
DOI - 10.1002/nur.4770140610
Subject(s) - cronbach's alpha , psychometrics , alpha (finance) , focus (optics) , psychology , statistics , clinical psychology , mathematics , physics , optics
In this article distinctions are made among some of the different conceptualizations of, and formulas for, Cronbach's coefficient alpha as it is applied to dichotomous or nondi‐chotomous, standardized or unstandardized, and weighted or unweighted data. Issues regarding the statistical significance of alpha and the occasionally encountered anomalies of artificially high alpha and negative values of alpha are given particular attention.