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

   Previous |
        DWI |
Convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,321       83.21       83.21
          1 |        665        6.65       89.86
          2 |        182        1.82       91.68
          3 |         58        0.58       92.26
          4 |         24        0.24       92.50
          5 |          5        0.05       92.55
          6 |         10        0.10       92.65
          7 |          3        0.03       92.68
          9 |          2        0.02       92.70
         99 |        730        7.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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