Frequencies for first 10,000 rows of vin_10 variable in vehicle dataset :

     vin_10 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,312       13.12       13.12
          0 |      5,091       50.91       64.03
          1 |        262        2.62       66.65
          2 |        231        2.31       68.96
          3 |        235        2.35       71.31
          4 |        238        2.38       73.69
          5 |        242        2.42       76.11
          6 |        229        2.29       78.40
          7 |        212        2.12       80.52
          8 |        224        2.24       82.76
          9 |      1,702       17.02       99.78
          A |          1        0.01       99.79
          C |          2        0.02       99.81
          G |          1        0.01       99.82
          O |         16        0.16       99.98
          P |          1        0.01       99.99
          Z |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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