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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,228       72.28       72.28
          1 |         35        0.35       72.63
          2 |         85        0.85       73.48
          3 |        770        7.70       81.18
          4 |         27        0.27       81.45
          5 |         12        0.12       81.57
          6 |         10        0.10       81.67
          7 |         34        0.34       82.01
          8 |          4        0.04       82.05
          9 |         21        0.21       82.26
         20 |        853        8.53       90.79
         21 |         16        0.16       90.95
         28 |        462        4.62       95.57
         29 |          4        0.04       95.61
         38 |          1        0.01       95.62
         39 |          2        0.02       95.64
         40 |        278        2.78       98.42
         41 |         12        0.12       98.54
         50 |         11        0.11       98.65
         60 |         21        0.21       98.86
         61 |          9        0.09       98.95
         62 |          4        0.04       98.99
         70 |         23        0.23       99.22
         71 |          1        0.01       99.23
         80 |          1        0.01       99.24
         98 |          2        0.02       99.26
         99 |         74        0.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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