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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         34        0.34        0.34
          0 |        945        9.45        9.79
          1 |        914        9.14       18.93
          2 |        852        8.52       27.45
          3 |        857        8.57       36.02
          4 |        853        8.53       44.55
          5 |        887        8.87       53.42
          6 |        885        8.85       62.27
          7 |        822        8.22       70.49
          8 |        823        8.23       78.72
          9 |      1,269       12.69       91.41
          A |          1        0.01       91.42
          B |          1        0.01       91.43
          C |          1        0.01       91.44
          D |          1        0.01       91.45
          E |          2        0.02       91.47
          F |          1        0.01       91.48
          L |          1        0.01       91.49
          M |          1        0.01       91.50
          O |          1        0.01       91.51
          S |          1        0.01       91.52
          T |          2        0.02       91.54
          X |        844        8.44       99.98
          Y |          1        0.01       99.99
          Z |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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