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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,177       71.77       71.77
          1 |         16        0.16       71.93
          2 |        100        1.00       72.93
          3 |        823        8.23       81.16
          4 |         40        0.40       81.56
          5 |         21        0.21       81.77
          6 |          9        0.09       81.86
          7 |          4        0.04       81.90
          8 |          4        0.04       81.94
          9 |          2        0.02       81.96
         20 |        880        8.80       90.76
         21 |         11        0.11       90.87
         28 |        488        4.88       95.75
         29 |          1        0.01       95.76
         30 |          3        0.03       95.79
         31 |          1        0.01       95.80
         38 |          1        0.01       95.81
         39 |          3        0.03       95.84
         40 |        264        2.64       98.48
         50 |         11        0.11       98.59
         60 |         22        0.22       98.81
         61 |         10        0.10       98.91
         62 |          2        0.02       98.93
         64 |          1        0.01       98.94
         70 |         19        0.19       99.13
         71 |          5        0.05       99.18
         72 |          1        0.01       99.19
         79 |          1        0.01       99.20
         99 |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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