Method: Utilities::Statistics#last_quartile

Defined in:
lib/utilities/utilities.rb

#last_quartile(already_sorted = false) ⇒ Object Also known as: upper_quartile

Return the last quartile of self



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# File 'lib/utilities/utilities.rb', line 97

def last_quartile( already_sorted = false )
  return nil if size < 4
  a = already_sorted ? self : sort
  a[((size / 2) + 1)..-1].extend(Utilities::Statistics).median( true )
end