This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
 Multivariate Statistics Package Symbol

KendallRankCorrelation

 KendallRankCorrelation[xlist, ylist]gives Kendall's rank correlation coefficient for the real-valued vectors xlist and ylist.
• Kendall's rank correlation coefficient is a measure of association based on the relative order of consecutive elements in the two lists.
• Kendall's rank correlation coefficient between x and y is given by , where nc is the number of concordant pairs of observations, nd is the number of discordant pairs, nx is the number of ties involving only the x variable, and ny is the number of ties involving only the y variable.
• A concordant pair of observations {xi, yi} and {xj, yj} is one such that both xi>xj and yi>yj or both xi<xj and yi<yj. A discordant pair of observations is one such that xi>xj and yi<yj or xi<xj and yi>yj.
• The arguments xlist and ylist can be any real-valued vectors of equal length.
Needs["MultivariateStatistics`"]
Kendall's rank correlation for two vectors:
 Out[2]=