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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        620        6.20        6.20
           |          1        0.01        6.21
          0 |      1,661       16.61       22.82
          1 |      1,030       10.30       33.12
          2 |        876        8.76       41.88
          3 |        788        7.88       49.76
          4 |        755        7.55       57.31
          5 |        666        6.66       63.97
          6 |        622        6.22       70.19
          7 |        572        5.72       75.91
          8 |        535        5.35       81.26
          9 |      1,817       18.17       99.43
          A |          7        0.07       99.50
          C |         35        0.35       99.85
          D |          2        0.02       99.87
          G |          1        0.01       99.88
          H |          1        0.01       99.89
          J |          1        0.01       99.90
          L |          1        0.01       99.91
          N |          1        0.01       99.92
          O |          2        0.02       99.94
          P |          1        0.01       99.95
          R |          1        0.01       99.96
          S |          1        0.01       99.97
          V |          1        0.01       99.98
          X |          1        0.01       99.99
          Z |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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