#nonparametric_statistic__nonparametricstatistic__distribution_free_statistic  a statistic computed without knowledge of the parameters of the distribution from which observations are drawn
  supertype:  #statistic  a datum that can be represented numerically
  subtype:  #rank-order_correlation_coefficient__rank-order_correlation__rank-difference_correlation_coefficient__rank-difference_correlation  the most commonly used method of computing a correlation coefficient between the ranks of scores on two variables
  subtype:  #Kendall_test  any of several nonparametric measures of correlation (used when the assumptions of standard correlational analysis are not met)
     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
  subtype:  #phi_coefficient__phicoefficient__phi_correlation__phicorrelation__fourfold_point_correlation  an index of the relation between any two sets of scores that can both be represented on ordered binary dimensions (e.g., male-female)

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