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

   Previous |
        DWI |
Convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,580       85.80       85.80
          1 |        530        5.30       91.10
          2 |         95        0.95       92.05
          3 |         10        0.10       92.15
          4 |          3        0.03       92.18
          5 |          1        0.01       92.19
          8 |          1        0.01       92.20
         99 |        780        7.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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