Frequencies for vin_12 variable in vehicle dataset :

     vin_12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         40        5.59        5.59
          0 |        183       25.56       31.15
          1 |        117       16.34       47.49
          2 |         87       12.15       59.64
          3 |         42        5.87       65.50
          4 |         38        5.31       70.81
          5 |         36        5.03       75.84
          6 |         18        2.51       78.35
          7 |         24        3.35       81.70
          8 |         19        2.65       84.36
          9 |         59        8.24       92.60
          A |         32        4.47       97.07
          B |         13        1.82       98.88
          C |          3        0.42       99.30
          D |          1        0.14       99.44
          M |          4        0.56      100.00
------------+-----------------------------------
      Total |        716      100.00

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