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

   Previous |
        DWI |
Convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,624       86.24       86.24
          1 |        537        5.37       91.61
          2 |         84        0.84       92.45
          3 |         11        0.11       92.56
          4 |          4        0.04       92.60
         99 |        740        7.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016