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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         88        0.88        0.88
          0 |        895        8.95        9.83
          1 |        937        9.37       19.20
          2 |        919        9.19       28.39
          3 |        873        8.73       37.12
          4 |        875        8.75       45.87
          5 |        874        8.74       54.61
          6 |        812        8.12       62.73
          7 |        856        8.56       71.29
          8 |        865        8.65       79.94
          9 |      1,180       11.80       91.74
          A |          1        0.01       91.75
          B |          4        0.04       91.79
          C |          3        0.03       91.82
          D |          4        0.04       91.86
          E |          2        0.02       91.88
          F |          3        0.03       91.91
          G |          4        0.04       91.95
          H |          1        0.01       91.96
          I |          3        0.03       91.99
          J |          1        0.01       92.00
          K |          1        0.01       92.01
          L |          3        0.03       92.04
          N |          1        0.01       92.05
          O |         65        0.65       92.70
          P |          2        0.02       92.72
          R |          2        0.02       92.74
          S |         12        0.12       92.86
          U |          1        0.01       92.87
          V |          1        0.01       92.88
          X |        698        6.98       99.86
          Y |          5        0.05       99.91
          Z |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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