def changed_coefficient_augmented_normalized_term_frequency(document, term)
      count = document.term_count(term)
      if count > 0
        0.2 + 0.8 * count / document.maximum_term_count
      else
        0
      end
    end
def changed_coefficient_augmented_normalized_term_frequency(document, term)
      count = document.term_count(term)
      if count > 0
        0.2 + 0.8 * count / document.maximum_term_count
      else
        0
      end
    end
Chisholm ATFC