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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,921       69.21       69.21
          1 |        121        1.21       70.42
          2 |        333        3.33       73.75
          3 |        446        4.46       78.21
          4 |         18        0.18       78.39
          5 |         11        0.11       78.50
          6 |          4        0.04       78.54
          7 |         35        0.35       78.89
          8 |         28        0.28       79.17
          9 |          8        0.08       79.25
         20 |        845        8.45       87.70
         21 |         22        0.22       87.92
         28 |        798        7.98       95.90
         29 |         26        0.26       96.16
         38 |          1        0.01       96.17
         39 |          3        0.03       96.20
         40 |        202        2.02       98.22
         41 |         15        0.15       98.37
         50 |         11        0.11       98.48
         60 |         11        0.11       98.59
         61 |          7        0.07       98.66
         62 |          2        0.02       98.68
         68 |          1        0.01       98.69
         70 |          7        0.07       98.76
         71 |          5        0.05       98.81
         72 |          3        0.03       98.84
         79 |          1        0.01       98.85
         80 |          2        0.02       98.87
         98 |         10        0.10       98.97
         99 |        103        1.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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