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.
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