Frequencies for vin_2 variable in vehicle dataset :

      vin_2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          7        1.48        1.48
          1 |          2        0.42        1.91
          9 |         45        9.53       11.44
          A |         53       11.23       22.67
          B |          9        1.91       24.58
          C |          7        1.48       26.06
          D |          2        0.42       26.48
          E |          1        0.21       26.69
          F |         58       12.29       38.98
          G |         23        4.87       43.86
          H |         25        5.30       49.15
          J |         20        4.24       53.39
          K |          6        1.27       54.66
          L |          4        0.85       55.51
          M |         42        8.90       64.41
          N |         28        5.93       70.34
          P |          3        0.64       70.97
          S |         46        9.75       80.72
          T |         75       15.89       96.61
          V |          6        1.27       97.88
          W |          1        0.21       98.09
          X |          3        0.64       98.73
          Y |          5        1.06       99.79
          Z |          1        0.21      100.00
------------+-----------------------------------
      Total |        472      100.00

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