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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,719       77.19       77.19
          1 |      1,250       12.50       89.69
          2 |        365        3.65       93.34
          3 |        127        1.27       94.61
          4 |         53        0.53       95.14
          5 |         13        0.13       95.27
          6 |          6        0.06       95.33
          7 |          3        0.03       95.36
          8 |          3        0.03       95.39
         99 |        389        3.89       99.28
          . |         72        0.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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