code: def get_delta_TR(tail_check_max, y_int):
      
      if tail_check_max == 0 or numpy.isnan(tail_check_max):
          return float('nan')
      delta_TR = (old_div(tail_check_max, abs(y_int))) * 100.
      return delta_TR
docs: input: tail_check_max, y_intercept
      output: delta_TR