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

   Previous |
        DWI |
Convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,237       92.37       92.37
          1 |        231        2.31       94.68
          2 |         62        0.62       95.30
          3 |          2        0.02       95.32
          4 |          2        0.02       95.34
         99 |        405        4.05       99.39
        998 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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