Interpretation of Somers’ D under four simple models
نویسنده
چکیده
(where E[·] denotes expectation), or, equivalently, as the difference between the probability that the two X,Y –pairs are concordant and the probability that the two X,Y –pairs are discordant. A pair of X,Y –pairs is said to be concordant if the larger X–value is paired with the larger Y –value, and is said to be discordant if the larger X–value is paired with the smaller Y –value. Somers’ D of Y with respect to X is defined as
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