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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,832       78.32       78.32
          1 |      1,168       11.68       90.00
          2 |        289        2.89       92.89
          3 |         96        0.96       93.85
          4 |         30        0.30       94.15
          5 |         11        0.11       94.26
          6 |          6        0.06       94.32
          7 |          2        0.02       94.34
          8 |          1        0.01       94.35
         99 |        492        4.92       99.27
          . |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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