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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,796       37.96       37.96
          0 |        554        5.54       43.50
          1 |        540        5.40       48.90
          2 |        517        5.17       54.07
          3 |        503        5.03       59.10
          4 |        489        4.89       63.99
          5 |        538        5.38       69.37
          6 |        531        5.31       74.68
          7 |        510        5.10       79.78
          8 |        517        5.17       84.95
          9 |        987        9.87       94.82
          A |          1        0.01       94.83
          B |          3        0.03       94.86
          D |          2        0.02       94.88
          F |          4        0.04       94.92
          G |          5        0.05       94.97
          I |          1        0.01       94.98
          J |          1        0.01       94.99
          L |          1        0.01       95.00
          O |          6        0.06       95.06
          S |          3        0.03       95.09
          T |          4        0.04       95.13
          X |        476        4.76       99.89
          Z |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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