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

     vin_12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        790        7.90        7.90
          0 |      1,529       15.29       23.19
          1 |      1,989       19.89       43.08
          2 |      1,149       11.49       54.57
          3 |        759        7.59       62.16
          4 |        504        5.04       67.20
          5 |        736        7.36       74.56
          6 |        549        5.49       80.05
          7 |        347        3.47       83.52
          8 |        239        2.39       85.91
          9 |        518        5.18       91.09
          A |        455        4.55       95.64
          B |        248        2.48       98.12
          C |         96        0.96       99.08
          D |         34        0.34       99.42
          E |         11        0.11       99.53
          F |          5        0.05       99.58
          I |          1        0.01       99.59
          J |          7        0.07       99.66
          M |         11        0.11       99.77
          N |          1        0.01       99.78
          O |         11        0.11       99.89
          P |          1        0.01       99.90
          Q |          1        0.01       99.91
          R |          2        0.02       99.93
          S |          2        0.02       99.95
          T |          1        0.01       99.96
          Z |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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