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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,353       73.53       73.53
          1 |      1,452       14.52       88.05
          2 |        451        4.51       92.56
          3 |        178        1.78       94.34
          4 |         49        0.49       94.83
          5 |         14        0.14       94.97
          6 |          4        0.04       95.01
          7 |          6        0.06       95.07
          8 |          2        0.02       95.09
         10 |          1        0.01       95.10
         99 |        490        4.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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