Frequencies for vin_9 variable in vehicle dataset :

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          6        0.84        0.84
          0 |         82       11.45       12.29
          1 |         63        8.80       21.09
          2 |         73       10.20       31.28
          3 |         55        7.68       38.97
          4 |         56        7.82       46.79
          5 |         64        8.94       55.73
          6 |         55        7.68       63.41
          7 |         61        8.52       71.93
          8 |         59        8.24       80.17
          9 |         96       13.41       93.58
          X |         46        6.42      100.00
------------+-----------------------------------
      Total |        716      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016