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

    Traffic |
    Control |
     Device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,815       78.15       78.15
          1 |          7        0.07       78.22
          2 |         70        0.70       78.92
          3 |        723        7.23       86.15
          4 |         17        0.17       86.32
          5 |         15        0.15       86.47
          6 |         10        0.10       86.57
          7 |          2        0.02       86.59
          8 |          4        0.04       86.63
          9 |          6        0.06       86.69
         20 |        816        8.16       94.85
         21 |         19        0.19       95.04
         28 |         50        0.50       95.54
         29 |          1        0.01       95.55
         30 |          1        0.01       95.56
         38 |          1        0.01       95.57
         40 |        321        3.21       98.78
         50 |         12        0.12       98.90
         60 |         28        0.28       99.18
         61 |         18        0.18       99.36
         62 |          4        0.04       99.40
         63 |          2        0.02       99.42
         69 |          2        0.02       99.44
         70 |         34        0.34       99.78
         71 |          5        0.05       99.83
         78 |          1        0.01       99.84
         80 |          1        0.01       99.85
         98 |          2        0.02       99.87
         99 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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