#statistic  a datum that can be represented numerically
  subtype:  average  demographic  deviation  moment.statistic  nonparametric_statistic  parametric_statistic  time_series  vital_statistics  correlational_statistics
  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:  thing_that_can_be_seen_as_a_relation  usable as relation type
           supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
              supertype:  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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