Frequencies for vin_7 variable in vehicle dataset :

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.28        0.28
          0 |         35        4.89        5.17
          1 |        120       16.76       21.93
          2 |        117       16.34       38.27
          3 |         45        6.28       44.55
          4 |         92       12.85       57.40
          5 |         60        8.38       65.78
          6 |         52        7.26       73.04
          7 |         45        6.28       79.33
          8 |         25        3.49       82.82
          9 |         82       11.45       94.27
          A |          5        0.70       94.97
          B |          5        0.70       95.67
          D |          4        0.56       96.23
          E |          4        0.56       96.79
          F |          1        0.14       96.93
          G |          1        0.14       97.07
          H |          4        0.56       97.63
          K |          1        0.14       97.77
          L |          3        0.42       98.18
          M |          2        0.28       98.46
          N |          2        0.28       98.74
          T |          4        0.56       99.30
          W |          3        0.42       99.72
          Y |          2        0.28      100.00
------------+-----------------------------------
      Total |        716      100.00

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