#correlational_statistics__correlation  a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
  subtype:  #curvilinear_correlation  #partial_correlation  #positive_correlation  #negative_correlation  #spurious_correlation
  part of:  #correlational_analysis
  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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