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

   PREVIOUS |
   SPEEDING |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,762       77.62       77.62
          1 |      1,209       12.09       89.71
          2 |        342        3.42       93.13
          3 |         96        0.96       94.09
          4 |         27        0.27       94.36
          5 |         11        0.11       94.47
          6 |          3        0.03       94.50
          7 |          1        0.01       94.51
         99 |        468        4.68       99.19
          . |         81        0.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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