Abstract
The kappa (K) statistic developed by Cohen (1960) is an index wellknown in psychology for measuring nominal scale response agreement (see Fleiss, 1973). In a typical application, each of two raters groups the same set of n objects using T unordered categories, A 1, A*, . . . . A T. If the resulting data are formalized as a T X T contingency table, such as that given in Table I, then in terms of this notation, Cohen’s index is defined by
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