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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        546        5.46        5.46
           |          2        0.02        5.48
          0 |      1,717       17.17       22.65
          1 |      1,119       11.19       33.84
          2 |        974        9.74       43.58
          3 |        801        8.01       51.59
          4 |        730        7.30       58.89
          5 |        714        7.14       66.03
          6 |        704        7.04       73.07
          7 |        602        6.02       79.09
          8 |        576        5.76       84.85
          9 |      1,465       14.65       99.50
          A |          6        0.06       99.56
          B |          1        0.01       99.57
          C |         31        0.31       99.88
          E |          1        0.01       99.89
          F |          2        0.02       99.91
          G |          2        0.02       99.93
          H |          2        0.02       99.95
          L |          1        0.01       99.96
          P |          2        0.02       99.98
          R |          1        0.01       99.99
          W |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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