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

Speed Limit |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         59        0.59        0.59
          5 |          2        0.02        0.61
         10 |          2        0.02        0.63
         15 |         26        0.26        0.89
         20 |         23        0.23        1.12
         25 |        709        7.09        8.21
         30 |        543        5.43       13.64
         35 |      1,276       12.76       26.40
         40 |        905        9.05       35.45
         45 |      1,151       11.51       46.96
         50 |        442        4.42       51.38
         55 |      4,177       41.77       93.15
         60 |          1        0.01       93.16
         65 |        546        5.46       98.62
         99 |        138        1.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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