Frequencies for sp_limit variable in accident dataset :

Speed Limit |      Freq.     Percent        Cum.
------------+-----------------------------------
         35 |        496       86.87       86.87
         40 |          2        0.35       87.22
         45 |         18        3.15       90.37
         50 |          5        0.88       91.24
         55 |         49        8.58       99.82
         99 |          1        0.18      100.00
------------+-----------------------------------
      Total |        571      100.00

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