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coefficient of concordance


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A measure of agreement between m observers who rank n items in order according to some characteristic. Let Rj be the total of the ranks assigned to the jth item and let S be given by . The coefficient of concordance, W, is given by , which takes values from 0 (no general agreement) to 1 (complete agreement). The coefficient was proposed by Sir Maurice Kendall and B. B. Smith in 1939.

Subjects: Probability and Statistics.


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