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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,738       67.38       67.38
          0 |        230        2.30       69.68
          1 |        223        2.23       71.91
          2 |        225        2.25       74.16
          3 |        229        2.29       76.45
          4 |        217        2.17       78.62
          5 |        221        2.21       80.83
          6 |        244        2.44       83.27
          7 |        246        2.46       85.73
          8 |        224        2.24       87.97
          9 |        946        9.46       97.43
          B |          1        0.01       97.44
          C |          2        0.02       97.46
          D |          1        0.01       97.47
          F |          6        0.06       97.53
          G |          1        0.01       97.54
          H |          2        0.02       97.56
          I |          3        0.03       97.59
          L |          2        0.02       97.61
          O |          7        0.07       97.68
          S |          4        0.04       97.72
          U |          1        0.01       97.73
          V |          1        0.01       97.74
          X |        222        2.22       99.96
          Y |          1        0.01       99.97
          Z |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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