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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,839       78.39       78.39
          1 |      1,201       12.01       90.40
          2 |        352        3.52       93.92
          3 |        110        1.10       95.02
          4 |         34        0.34       95.36
          5 |         14        0.14       95.50
          6 |          4        0.04       95.54
          7 |          2        0.02       95.56
          8 |          3        0.03       95.59
         99 |        379        3.79       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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