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

    Traffic |
    Control |
     Device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,790       77.90       77.90
          1 |         12        0.12       78.02
          2 |         50        0.50       78.52
          3 |        663        6.63       85.15
          4 |         19        0.19       85.34
          5 |         16        0.16       85.50
          6 |          7        0.07       85.57
          7 |          2        0.02       85.59
          8 |          7        0.07       85.66
          9 |         32        0.32       85.98
         20 |        818        8.18       94.16
         21 |         22        0.22       94.38
         28 |         70        0.70       95.08
         29 |          2        0.02       95.10
         30 |          1        0.01       95.11
         31 |          1        0.01       95.12
         40 |        384        3.84       98.96
         50 |          9        0.09       99.05
         60 |         17        0.17       99.22
         61 |         13        0.13       99.35
         62 |          3        0.03       99.38
         63 |          1        0.01       99.39
         68 |          1        0.01       99.40
         69 |          5        0.05       99.45
         70 |         21        0.21       99.66
         71 |          1        0.01       99.67
         72 |          2        0.02       99.69
         73 |          1        0.01       99.70
         79 |          6        0.06       99.76
         80 |          1        0.01       99.77
         98 |          2        0.02       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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