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

    Traffic |
    Control |
     Device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,693       76.93       76.93
          1 |        170        1.70       78.63
          2 |        116        1.16       79.79
          3 |        431        4.31       84.10
          4 |         29        0.29       84.39
          5 |          7        0.07       84.46
          6 |          4        0.04       84.50
          7 |          4        0.04       84.54
          8 |          6        0.06       84.60
          9 |         27        0.27       84.87
         20 |        939        9.39       94.26
         21 |         28        0.28       94.54
         28 |        145        1.45       95.99
         29 |          1        0.01       96.00
         39 |          2        0.02       96.02
         40 |        259        2.59       98.61
         50 |         11        0.11       98.72
         60 |         16        0.16       98.88
         61 |         14        0.14       99.02
         62 |          4        0.04       99.06
         69 |          6        0.06       99.12
         70 |         16        0.16       99.28
         71 |          4        0.04       99.32
         72 |          2        0.02       99.34
         73 |          2        0.02       99.36
         80 |          3        0.03       99.39
         98 |          3        0.03       99.42
         99 |         58        0.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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