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rs    =    ΣR(X)R(Y) − n [0.5 x (n + 1)]2
√{ΣR(X)2 −n [0.5(n + 1)]2} √{[ΣR(Y)2 −n [0.5(n + 1)]2}
  • rs is the Spearman correlation coefficient,
  • R(X) and R(Y) are the ranks of the individual observations of the two variables,
  • n is the number of bivariate observations