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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,009       70.09       70.09
          1 |         36        0.36       70.45
          2 |        342        3.42       73.87
          3 |        678        6.78       80.65
          4 |         20        0.20       80.85
          5 |         10        0.10       80.95
          6 |          2        0.02       80.97
          7 |          7        0.07       81.04
          8 |          7        0.07       81.11
          9 |         16        0.16       81.27
         20 |        811        8.11       89.38
         21 |         16        0.16       89.54
         28 |        740        7.40       96.94
         29 |         11        0.11       97.05
         40 |        204        2.04       99.09
         41 |          7        0.07       99.16
         50 |          9        0.09       99.25
         60 |         18        0.18       99.43
         61 |          7        0.07       99.50
         63 |          1        0.01       99.51
         68 |          1        0.01       99.52
         70 |          9        0.09       99.61
         71 |          5        0.05       99.66
         72 |          3        0.03       99.69
         98 |          4        0.04       99.73
         99 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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