#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?"
  subtype:  #Pearson_product-moment_correlation_coefficient  #multiple_correlation_coefficient  #biserial_correlation_coefficient  #split-half_correlation  #tetrachoric_correlation_coefficient
  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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