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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,072       70.72       70.72
          1 |         23        0.23       70.95
          2 |        141        1.41       72.36
          3 |        692        6.92       79.28
          4 |        149        1.49       80.77
          5 |         16        0.16       80.93
          6 |         14        0.14       81.07
          7 |          1        0.01       81.08
          8 |         11        0.11       81.19
          9 |          3        0.03       81.22
         20 |        900        9.00       90.22
         21 |          8        0.08       90.30
         28 |        626        6.26       96.56
         30 |          1        0.01       96.57
         40 |        183        1.83       98.40
         50 |         10        0.10       98.50
         60 |         22        0.22       98.72
         61 |         16        0.16       98.88
         62 |          3        0.03       98.91
         63 |          1        0.01       98.92
         69 |          1        0.01       98.93
         70 |         16        0.16       99.09
         71 |         10        0.10       99.19
         72 |          1        0.01       99.20
         73 |          1        0.01       99.21
         79 |          1        0.01       99.22
         80 |          1        0.01       99.23
         98 |          2        0.02       99.25
         99 |         75        0.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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