#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
  supertype:  #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
        supertype:  #datum__data_point  an item of factual information derived from measurement or research
           supertype:  #information  knowledge acquired through study or experience or instruction
              supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
                 supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                    supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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