Frequencies for first 10,000 rows of vin_12 variable in vehicle dataset :

     vin_12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        630        6.30        6.30
          0 |      1,616       16.16       22.46
          1 |      2,049       20.49       42.95
          2 |      1,153       11.53       54.48
          3 |        776        7.76       62.24
          4 |        479        4.79       67.03
          5 |        752        7.52       74.55
          6 |        549        5.49       80.04
          7 |        367        3.67       83.71
          8 |        217        2.17       85.88
          9 |        526        5.26       91.14
          A |        465        4.65       95.79
          B |        244        2.44       98.23
          C |         86        0.86       99.09
          D |         32        0.32       99.41
          E |          8        0.08       99.49
          F |          4        0.04       99.53
          G |          1        0.01       99.54
          H |          3        0.03       99.57
          J |         10        0.10       99.67
          K |          3        0.03       99.70
          L |          1        0.01       99.71
          M |          9        0.09       99.80
          O |          5        0.05       99.85
          Q |          1        0.01       99.86
          R |          1        0.01       99.87
          S |          5        0.05       99.92
          T |          4        0.04       99.96
          X |          1        0.01       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