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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,962       29.62       29.62
          0 |        602        6.02       35.64
          1 |        601        6.01       41.65
          2 |        573        5.73       47.38
          3 |        602        6.02       53.40
          4 |        610        6.10       59.50
          5 |        599        5.99       65.49
          6 |        590        5.90       71.39
          7 |        621        6.21       77.60
          8 |        584        5.84       83.44
          9 |      1,009       10.09       93.53
          A |          1        0.01       93.54
          B |          2        0.02       93.56
          D |          1        0.01       93.57
          F |          6        0.06       93.63
          G |          2        0.02       93.65
          H |          2        0.02       93.67
          L |          2        0.02       93.69
          O |          6        0.06       93.75
          Q |          1        0.01       93.76
          R |          1        0.01       93.77
          S |          6        0.06       93.83
          U |          1        0.01       93.84
          X |        612        6.12       99.96
          Y |          1        0.01       99.97
          Z |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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