Frequencies for first 10,000 rows of vin_9 variable in vehicle dataset :

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        538        5.38        5.38
           |          1        0.01        5.39
          0 |      1,794       17.94       23.33
          1 |      1,115       11.15       34.48
          2 |        935        9.35       43.83
          3 |        842        8.42       52.25
          4 |        735        7.35       59.60
          5 |        749        7.49       67.09
          6 |        712        7.12       74.21
          7 |        621        6.21       80.42
          8 |        677        6.77       87.19
          9 |      1,222       12.22       99.41
          A |          4        0.04       99.45
          B |          3        0.03       99.48
          C |         29        0.29       99.77
          D |          1        0.01       99.78
          E |          1        0.01       99.79
          F |          3        0.03       99.82
          H |          1        0.01       99.83
          L |          6        0.06       99.89
          R |          1        0.01       99.90
          S |          2        0.02       99.92
          T |          1        0.01       99.93
          U |          4        0.04       99.97
          V |          1        0.01       99.98
          X |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016