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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,069       70.69       70.69
          1 |         52        0.52       71.21
          2 |        257        2.57       73.78
          3 |        599        5.99       79.77
          4 |         11        0.11       79.88
          5 |          6        0.06       79.94
          6 |          2        0.02       79.96
          7 |         45        0.45       80.41
          8 |         13        0.13       80.54
          9 |          8        0.08       80.62
         20 |        856        8.56       89.18
         21 |         20        0.20       89.38
         28 |        671        6.71       96.09
         29 |         21        0.21       96.30
         30 |          1        0.01       96.31
         38 |          1        0.01       96.32
         39 |          2        0.02       96.34
         40 |        188        1.88       98.22
         41 |          8        0.08       98.30
         50 |         11        0.11       98.41
         60 |         18        0.18       98.59
         61 |          5        0.05       98.64
         62 |          2        0.02       98.66
         63 |          1        0.01       98.67
         69 |          1        0.01       98.68
         70 |          9        0.09       98.77
         71 |         11        0.11       98.88
         72 |          3        0.03       98.91
         80 |          2        0.02       98.93
         98 |          2        0.02       98.95
         99 |        105        1.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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