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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         19        0.19        0.19
          0 |        907        9.07        9.26
          1 |        899        8.99       18.25
          2 |        926        9.26       27.51
          3 |        909        9.09       36.60
          4 |        821        8.21       44.81
          5 |        865        8.65       53.46
          6 |        850        8.50       61.96
          7 |        827        8.27       70.23
          8 |        842        8.42       78.65
          9 |      1,250       12.50       91.15
          B |          1        0.01       91.16
          C |          4        0.04       91.20
          E |          1        0.01       91.21
          H |          1        0.01       91.22
          L |          2        0.02       91.24
          O |         14        0.14       91.38
          Q |          1        0.01       91.39
          R |          1        0.01       91.40
          T |          1        0.01       91.41
          X |        859        8.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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