Kappa as a Parameter of a Symmetry Model for Rater Agreement

Christof Schuster

Journal of Educational and Behavioral Statistics, 2001, vol. 26, issue 3, 331-342

Abstract: If two raters assign targets to categories, the ratings can be arranged in a two-dimensional contingency table. A model for the frequencies in such a contingency table is presented for which Cohen’s kappa is a parameter. The model is based on two assumptions. First, the joint classification probabilities for the raters satisfy symmetry; second, the ratio of observed agreement to chance agreement is constant across categories. The model is illustrated using data from a study of the psychobiology of depression.

Keywords: Kappa; marginal homogeneity; rater agreement; rater reliability; symmetry model (search for similar items in EconPapers)
Date: 2001
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jedbes:v:26:y:2001:i:3:p:331-342

DOI: 10.3102/10769986026003331

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