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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,426       54.26       54.26
          0 |        394        3.94       58.20
          1 |        352        3.52       61.72
          2 |        369        3.69       65.41
          3 |        395        3.95       69.36
          4 |        368        3.68       73.04
          5 |        349        3.49       76.53
          6 |        370        3.70       80.23
          7 |        353        3.53       83.76
          8 |        354        3.54       87.30
          9 |        897        8.97       96.27
          A |          1        0.01       96.28
          B |          2        0.02       96.30
          D |          3        0.03       96.33
          F |          6        0.06       96.39
          G |          1        0.01       96.40
          I |          1        0.01       96.41
          J |          1        0.01       96.42
          K |          1        0.01       96.43
          O |          5        0.05       96.48
          S |          3        0.03       96.51
          U |          1        0.01       96.52
          X |        346        3.46       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