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Kappa as a Parameter of a Symmetry Model for Rater Agreement

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  • Christof Schuster

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.

Suggested Citation

  • Christof Schuster, 2001. "Kappa as a Parameter of a Symmetry Model for Rater Agreement," Journal of Educational and Behavioral Statistics, , vol. 26(3), pages 331-342, September.
    • Handle: RePEc:sae:jedbes:v:26:y:2001:i:3:p:331-342
    DOI: 10.3102/10769986026003331
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