docs: def gamma_CC(values_list1, values_list2):
      '''
      Goodman and Kruskal's gamma correlation coefficient wrapper
      :param values_list1: a list of values
      :param values_list2: a second list of values of equal length with corresponding entries
      :return: Gamma correlation coefficient (rank correlation ignoring ties)
      '''
      ranks1 = get_ranks(values_list1)
      ranks_list1 = []
      for value in values_list1:
          rank = ranks1[value]
          ranks_list1.append(rank)
      ranks2 = get_ranks(values_list2)
      ranks_list2 = []
      for value in values_list2:
          rank = ranks2[value]
          ranks_list2.append(rank)
      return gamma(ranks_list1, ranks_list2)[3]