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

        vin |
character(9 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         18        0.18        0.18
          0 |        911        9.11        9.29
          1 |        893        8.93       18.22
          2 |        877        8.77       26.99
          3 |        908        9.08       36.07
          4 |        844        8.44       44.51
          5 |        895        8.95       53.46
          6 |        808        8.08       61.54
          7 |        891        8.91       70.45
          8 |        870        8.70       79.15
          9 |      1,194       11.94       91.09
          B |          2        0.02       91.11
          C |          1        0.01       91.12
          E |          1        0.01       91.13
          H |          1        0.01       91.14
          L |          1        0.01       91.15
          S |          1        0.01       91.16
          V |          1        0.01       91.17
          W |          1        0.01       91.18
          X |        881        8.81       99.99
          Y |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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