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

   Previous |
        DWI |
Convictions |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,270       82.70       82.70
          1 |        733        7.33       90.03
          2 |        178        1.78       91.81
          3 |         34        0.34       92.15
          4 |         21        0.21       92.36
          5 |         10        0.10       92.46
          6 |          3        0.03       92.49
          7 |          1        0.01       92.50
          8 |          4        0.04       92.54
          9 |          1        0.01       92.55
         10 |          2        0.02       92.57
         13 |          1        0.01       92.58
         40 |          1        0.01       92.59
         99 |        741        7.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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