#Kendall_test  any of several nonparametric measures of correlation (used when the assumptions of standard correlational analysis are not met)
  supertype:  nonparametric_statistic__nonparametricstatistic__distribution_free_statistic  a statistic computed without knowledge of the parameters of the distribution from which observations are drawn
  subtype:  Kendall_partial_rank_correlation  a nonparametric measure of partial correlation
  subtype:  coefficient_of_concordance  a coefficient of agreement (concordance) between different sets of rank orderings of the same set of things
  subtype:  tau_coefficient_of_correlation__Kendall's_tau__Kendall_rank_correlation  a nonparametric measure of the agreement between two rankings

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