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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,623       26.23       26.23
          0 |        686        6.86       33.09
          1 |        600        6.00       39.09
          2 |        642        6.42       45.51
          3 |        628        6.28       51.79
          4 |        609        6.09       57.88
          5 |        658        6.58       64.46
          6 |        645        6.45       70.91
          7 |        653        6.53       77.44
          8 |        646        6.46       83.90
          9 |        971        9.71       93.61
          A |          1        0.01       93.62
          B |          4        0.04       93.66
          C |          5        0.05       93.71
          D |          2        0.02       93.73
          E |          1        0.01       93.74
          F |          4        0.04       93.78
          G |          2        0.02       93.80
          J |          1        0.01       93.81
          L |          1        0.01       93.82
          O |          3        0.03       93.85
          P |          1        0.01       93.86
          S |          6        0.06       93.92
          T |          1        0.01       93.93
          U |          1        0.01       93.94
          X |        604        6.04       99.98
          Z |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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