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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,305       73.05       73.05
          1 |      1,381       13.81       86.86
          2 |        436        4.36       91.22
          3 |        173        1.73       92.95
          4 |         65        0.65       93.60
          5 |         28        0.28       93.88
          6 |         13        0.13       94.01
          7 |          4        0.04       94.05
          8 |          5        0.05       94.10
         99 |        590        5.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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