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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,730       77.30       77.30
          1 |      1,265       12.65       89.95
          2 |        353        3.53       93.48
          3 |        118        1.18       94.66
          4 |         55        0.55       95.21
          5 |         18        0.18       95.39
          6 |          7        0.07       95.46
          8 |          2        0.02       95.48
         99 |        373        3.73       99.21
          . |         79        0.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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