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

    Traffic |
    Control |
     Device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,791       77.91       77.91
          1 |          9        0.09       78.00
          2 |         89        0.89       78.89
          3 |        670        6.70       85.59
          4 |         14        0.14       85.73
          5 |         13        0.13       85.86
          6 |          4        0.04       85.90
          7 |          4        0.04       85.94
          8 |          3        0.03       85.97
          9 |          6        0.06       86.03
         20 |        825        8.25       94.28
         21 |         19        0.19       94.47
         28 |         49        0.49       94.96
         29 |          5        0.05       95.01
         30 |          2        0.02       95.03
         40 |        375        3.75       98.78
         50 |         17        0.17       98.95
         60 |         21        0.21       99.16
         61 |         23        0.23       99.39
         62 |          8        0.08       99.47
         68 |          2        0.02       99.49
         69 |          1        0.01       99.50
         70 |         25        0.25       99.75
         71 |          4        0.04       99.79
         72 |          2        0.02       99.81
         79 |          1        0.01       99.82
         80 |          1        0.01       99.83
         98 |          2        0.02       99.85
         99 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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