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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,052       70.52       70.52
          1 |         16        0.16       70.68
          2 |        119        1.19       71.87
          3 |        594        5.94       77.81
          4 |        170        1.70       79.51
          5 |         13        0.13       79.64
          6 |          5        0.05       79.69
          7 |          1        0.01       79.70
          8 |          7        0.07       79.77
          9 |          7        0.07       79.84
         20 |        931        9.31       89.15
         21 |         17        0.17       89.32
         28 |        190        1.90       91.22
         29 |          1        0.01       91.23
         30 |          2        0.02       91.25
         38 |          2        0.02       91.27
         39 |          1        0.01       91.28
         40 |        743        7.43       98.71
         50 |         16        0.16       98.87
         60 |         33        0.33       99.20
         61 |         15        0.15       99.35
         62 |          4        0.04       99.39
         63 |          1        0.01       99.40
         64 |          1        0.01       99.41
         70 |         26        0.26       99.67
         71 |          9        0.09       99.76
         72 |          3        0.03       99.79
         73 |          1        0.01       99.80
         80 |          1        0.01       99.81
         98 |          4        0.04       99.85
         99 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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