module Enumerable

  # In Statistics mode is the value that occurs most
  # frequently in a given set of data.
  #
  # CREDIT: Robert Klemme

  def mode
    max = 0
    c = Hash.new 0
    each {|x| cc = c[x] += 1; max = cc if cc > max}
    c.select {|k,v| v == max}.map {|k,v| k}
  end

end