Frequencies for first 10,000 rows of sp_limit variable in accident dataset :

Speed Limit |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         57        0.57        0.57
          5 |          2        0.02        0.59
         10 |          5        0.05        0.64
         15 |         33        0.33        0.97
         20 |         32        0.32        1.29
         25 |        708        7.08        8.37
         30 |        607        6.07       14.44
         35 |      1,435       14.35       28.79
         40 |        735        7.35       36.14
         45 |      1,220       12.20       48.34
         50 |        423        4.23       52.57
         55 |      4,330       43.30       95.87
         99 |        413        4.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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