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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,793       77.93       77.93
          1 |      1,233       12.33       90.26
          2 |        334        3.34       93.60
          3 |        107        1.07       94.67
          4 |         37        0.37       95.04
          5 |         14        0.14       95.18
          6 |          2        0.02       95.20
          7 |          2        0.02       95.22
          8 |          2        0.02       95.24
         99 |        414        4.14       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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