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LaTeX Math Inline
bodyH = {\sum}_{i \neq j} \{ {\rm sgn(x_i - \bar x)} \neq {\rm sgn(y_i - \bar y)} \}
  — number of pairs with the opposite sign of deviation from the mean value  


The Kendall correlation coefficient is similar to Spearmen correlation coefficient in nature but sometimes has advantage by a more reliable pick up a correlation in noisy data.