Frequencies for tra_cont variable in accident dataset :

    Traffic |
    Control |
     Device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        412       84.77       84.77
          1 |         13        2.67       87.45
          2 |          6        1.23       88.68
          3 |          8        1.65       90.33
          4 |          3        0.62       90.95
          8 |          5        1.03       91.98
         20 |         13        2.67       94.65
         28 |          3        0.62       95.27
         29 |          1        0.21       95.47
         31 |          1        0.21       95.68
         40 |         14        2.88       98.56
         50 |          1        0.21       98.77
         98 |          5        1.03       99.79
         99 |          1        0.21      100.00
------------+-----------------------------------
      Total |        486      100.00

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