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

   Previous |
        DWI |
Convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,787       87.87       87.87
          1 |        475        4.75       92.62
          2 |        114        1.14       93.76
          3 |         19        0.19       93.95
          4 |          7        0.07       94.02
          5 |          1        0.01       94.03
         99 |        597        5.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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