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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,707       77.07       77.07
          1 |      1,295       12.95       90.02
          2 |        369        3.69       93.71
          3 |        112        1.12       94.83
          4 |         42        0.42       95.25
          5 |         17        0.17       95.42
          6 |          3        0.03       95.45
          7 |          3        0.03       95.48
         99 |        411        4.11       99.59
          . |         41        0.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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