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Creating comparability among reliability coefficients: the case of Cronbach alpha and Cohen kappa
1Department of Psychology, University of Winnipeg, 515 Portage Avenue, Winnipeg, Manitoba, Canada R3B 2E9. psychology@io.uwinnipeg.ca
Psychological Reports
|March 29, 2001
Abstract:
Cronbach alpha and Cohen kappa were compared and found to differ along two major facets. A fourfold classification system based on these facets clarifies the double contrast and produces a common metric allowing direct comparability. A new estimator, coefficient beta, is introduced in the process and is presented as a complement to coefficient alpha in estimating the psychometric properties of test scores and ratings.