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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         18        0.18        0.18
          * |          1        0.01        0.19
          0 |        923        9.23        9.42
          1 |        885        8.85       18.27
          2 |        921        9.21       27.48
          3 |        890        8.90       36.38
          4 |        844        8.44       44.82
          5 |        870        8.70       53.52
          6 |        847        8.47       61.99
          7 |        922        9.22       71.21
          8 |        864        8.64       79.85
          9 |      1,186       11.86       91.71
          C |          2        0.02       91.73
          H |          1        0.01       91.74
          M |          2        0.02       91.76
          P |          1        0.01       91.77
          S |          1        0.01       91.78
          X |        819        8.19       99.97
          Y |          1        0.01       99.98
          Z |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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