Frequencies for first 10,000 rows of prev_dwi variable in vehicle dataset :

   Previous |
        DWI |
Convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,688       86.88       86.88
          1 |        567        5.67       92.55
          2 |         88        0.88       93.43
          3 |         15        0.15       93.58
          4 |          4        0.04       93.62
         99 |        638        6.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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