Frequencies for vin_12 variable in vehicle dataset :

     vin_12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         58        7.59        7.59
          0 |        163       21.34       28.93
          1 |        126       16.49       45.42
          2 |         61        7.98       53.40
          3 |         47        6.15       59.55
          4 |         37        4.84       64.40
          5 |         48        6.28       70.68
          6 |         24        3.14       73.82
          7 |         28        3.66       77.49
          8 |         22        2.88       80.37
          9 |        104       13.61       93.98
          A |         26        3.40       97.38
          B |         10        1.31       98.69
          C |          2        0.26       98.95
          H |          1        0.13       99.08
          J |          1        0.13       99.21
          M |          5        0.65       99.87
          N |          1        0.13      100.00
------------+-----------------------------------
      Total |        764      100.00

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