Frequencies for first 10,000 rows of vin_6 variable in vehicle dataset :

      vin_6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         66        0.66        0.66
           |          1        0.01        0.67
          0 |        924        9.24        9.91
          1 |      1,443       14.43       24.34
          2 |        831        8.31       32.65
          3 |        590        5.90       38.55
          4 |        497        4.97       43.52
          5 |        666        6.66       50.18
          6 |        598        5.98       56.16
          7 |        645        6.45       62.61
          8 |        705        7.05       69.66
          9 |      1,321       13.21       82.87
          A |        293        2.93       85.80
          B |        116        1.16       86.96
          C |        103        1.03       87.99
          D |         86        0.86       88.85
          E |        126        1.26       90.11
          F |         89        0.89       91.00
          G |         51        0.51       91.51
          H |        153        1.53       93.04
          I |          2        0.02       93.06
          J |         51        0.51       93.57
          K |         52        0.52       94.09
          L |         68        0.68       94.77
          M |         18        0.18       94.95
          N |         40        0.40       95.35
          O |          1        0.01       95.36
          P |         84        0.84       96.20
          Q |         13        0.13       96.33
          R |         56        0.56       96.89
          S |         52        0.52       97.41
          T |         57        0.57       97.98
          U |         24        0.24       98.22
          V |         21        0.21       98.43
          W |         19        0.19       98.62
          X |         18        0.18       98.80
          Y |         40        0.40       99.20
          Z |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016