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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         33        0.33        0.33
          0 |        887        8.87        9.20
          1 |        876        8.76       17.96
          2 |        833        8.33       26.29
          3 |        896        8.96       35.25
          4 |        883        8.83       44.08
          5 |        906        9.06       53.14
          6 |        838        8.38       61.52
          7 |        801        8.01       69.53
          8 |        853        8.53       78.06
          9 |      1,317       13.17       91.23
          B |          2        0.02       91.25
          D |          1        0.01       91.26
          E |          2        0.02       91.28
          O |          2        0.02       91.30
          S |          1        0.01       91.31
          T |          2        0.02       91.33
          X |        867        8.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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