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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,841       78.41       78.41
          1 |      1,191       11.91       90.32
          2 |        315        3.15       93.47
          3 |         82        0.82       94.29
          4 |         36        0.36       94.65
          5 |          7        0.07       94.72
          6 |          4        0.04       94.76
          7 |          1        0.01       94.77
          8 |          1        0.01       94.78
         99 |        470        4.70       99.48
          . |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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