Frequencies for vin_11 variable in vehicle dataset :

     vin_11 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         25        3.49        3.49
          0 |        113       15.78       19.27
          1 |         20        2.79       22.07
          2 |         25        3.49       25.56
          3 |         12        1.68       27.23
          4 |         25        3.49       30.73
          5 |         35        4.89       35.61
          6 |         13        1.82       37.43
          7 |         28        3.91       41.34
          8 |         10        1.40       42.74
          9 |         62        8.66       51.40
          A |         17        2.37       53.77
          B |         11        1.54       55.31
          C |         15        2.09       57.40
          D |         13        1.82       59.22
          E |          4        0.56       59.78
          F |          8        1.12       60.89
          G |          3        0.42       61.31
          H |         24        3.35       64.66
          J |         10        1.40       66.06
          K |         21        2.93       68.99
          L |         11        1.54       70.53
          M |         14        1.96       72.49
          N |         18        2.51       75.00
          P |          4        0.56       75.56
          R |          4        0.56       76.12
          S |         13        1.82       77.93
          T |         13        1.82       79.75
          U |         91       12.71       92.46
          V |          8        1.12       93.58
          W |         22        3.07       96.65
          X |          7        0.98       97.63
          Y |          3        0.42       98.04
          Z |         14        1.96      100.00
------------+-----------------------------------
      Total |        716      100.00

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