#biserial_correlation_coefficient__biserial_correlation  a correlation coefficient in which one variable is many-valued and the other is dichotomous
  supertype:  #correlation_coefficient__correlationcoefficient__coefficient_of_correlation__correlation  a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation); "what is the correlation between those two variables?"
     supertype:  #parametric_statistic  any statistic computed by procedures that assume the data were drawn from a particular distribution
        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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