# 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 r S = 1 – 6 Σ d ² /n (n ² – 1), where Σ d ² is the sum of the squares of the differences of ranks between the two orderings and n is the number of items in eachAlso called: Spearman's rank-order correlation coefficient

## Word Origin

named after Charles E. Spearman (1863–1945), English mathematician and statistician

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