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Spearman's rank-order coefficient

a statistic measuring the extent to which two sets of discrete data place the distinct items in the same order, given by rS = 16Σd²/n(n² – 1), where Σd² is the sum of the squares of the differences of ranks between the two orderings and n is the number of items in each Also called Spearman's rank-order correlation coefficient
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named after Charles E. Spearman (1863–1945), English mathematician and statistician
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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