Frequencies for first 10,000 rows of vin_7 variable in vehicle dataset :

        VIN |
Character(7 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          9        0.09        0.09
          - |          2        0.02        0.11
          0 |        376        3.76        3.87
          1 |        956        9.56       13.43
          2 |      1,397       13.97       27.40
          3 |        996        9.96       37.36
          4 |        918        9.18       46.54
          5 |        645        6.45       52.99
          6 |        994        9.94       62.93
          7 |        476        4.76       67.69
          8 |        826        8.26       75.95
          9 |      1,004       10.04       85.99
          A |        132        1.32       87.31
          B |        113        1.13       88.44
          C |        192        1.92       90.36
          D |        101        1.01       91.37
          E |        169        1.69       93.06
          F |         82        0.82       93.88
          G |         51        0.51       94.39
          H |         50        0.50       94.89
          J |         47        0.47       95.36
          K |         24        0.24       95.60
          L |         65        0.65       96.25
          M |         52        0.52       96.77
          N |         12        0.12       96.89
          P |         63        0.63       97.52
          Q |          2        0.02       97.54
          R |         15        0.15       97.69
          S |         17        0.17       97.86
          T |         21        0.21       98.07
          U |          5        0.05       98.12
          V |         40        0.40       98.52
          W |         72        0.72       99.24
          X |          6        0.06       99.30
          Y |         45        0.45       99.75
          Z |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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