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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,067       70.67       70.67
          1 |         61        0.61       71.28
          2 |         81        0.81       72.09
          3 |        790        7.90       79.99
          4 |         11        0.11       80.10
          5 |         27        0.27       80.37
          6 |         16        0.16       80.53
          7 |         10        0.10       80.63
          8 |          5        0.05       80.68
          9 |         49        0.49       81.17
         20 |        788        7.88       89.05
         21 |         10        0.10       89.15
         28 |        637        6.37       95.52
         29 |         33        0.33       95.85
         30 |          2        0.02       95.87
         31 |          2        0.02       95.89
         39 |          1        0.01       95.90
         40 |        250        2.50       98.40
         41 |         13        0.13       98.53
         50 |         18        0.18       98.71
         60 |         20        0.20       98.91
         61 |          9        0.09       99.00
         62 |          3        0.03       99.03
         63 |          1        0.01       99.04
         70 |          7        0.07       99.11
         71 |          1        0.01       99.12
         80 |          2        0.02       99.14
         98 |          5        0.05       99.19
         99 |         81        0.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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