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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,400       74.00       74.00
          1 |         33        0.33       74.33
          2 |         90        0.90       75.23
          3 |        803        8.03       83.26
          4 |         23        0.23       83.49
          5 |         29        0.29       83.78
          6 |          4        0.04       83.82
          7 |          5        0.05       83.87
          8 |         10        0.10       83.97
          9 |          3        0.03       84.00
         20 |        902        9.02       93.02
         21 |          9        0.09       93.11
         28 |        276        2.76       95.87
         29 |          1        0.01       95.88
         30 |          1        0.01       95.89
         38 |          1        0.01       95.90
         39 |          1        0.01       95.91
         40 |        256        2.56       98.47
         50 |         18        0.18       98.65
         60 |         22        0.22       98.87
         61 |         12        0.12       98.99
         62 |          1        0.01       99.00
         69 |          1        0.01       99.01
         70 |         15        0.15       99.16
         71 |          6        0.06       99.22
         72 |          1        0.01       99.23
         78 |          1        0.01       99.24
         80 |          1        0.01       99.25
         98 |          1        0.01       99.26
         99 |         74        0.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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