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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        737        7.37        7.37
          0 |      3,905       39.05       46.42
          1 |        698        6.98       53.40
          2 |        590        5.90       59.30
          3 |        452        4.52       63.82
          4 |        428        4.28       68.10
          5 |        381        3.81       71.91
          6 |        344        3.44       75.35
          7 |        331        3.31       78.66
          8 |        299        2.99       81.65
          9 |      1,798       17.98       99.63
          A |          2        0.02       99.65
          B |          1        0.01       99.66
          C |          3        0.03       99.69
          D |          1        0.01       99.70
          H |          1        0.01       99.71
          L |          1        0.01       99.72
          O |         21        0.21       99.93
          P |          2        0.02       99.95
          R |          1        0.01       99.96
          S |          3        0.03       99.99
          U |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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