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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,631       76.31       76.31
          1 |      1,347       13.47       89.78
          2 |        371        3.71       93.49
          3 |        115        1.15       94.64
          4 |         33        0.33       94.97
          5 |         14        0.14       95.11
          6 |          7        0.07       95.18
          7 |          2        0.02       95.20
         99 |        417        4.17       99.37
          . |         63        0.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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