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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,465       74.65       74.65
          1 |         22        0.22       74.87
          2 |         96        0.96       75.83
          3 |        841        8.41       84.24
          4 |         18        0.18       84.42
          5 |         17        0.17       84.59
          6 |          2        0.02       84.61
          7 |          4        0.04       84.65
          8 |          6        0.06       84.71
          9 |          8        0.08       84.79
         20 |        845        8.45       93.24
         21 |         16        0.16       93.40
         28 |        225        2.25       95.65
         29 |          4        0.04       95.69
         30 |          2        0.02       95.71
         38 |          1        0.01       95.72
         39 |          2        0.02       95.74
         40 |        269        2.69       98.43
         50 |         18        0.18       98.61
         60 |         22        0.22       98.83
         61 |         10        0.10       98.93
         62 |          4        0.04       98.97
         63 |          1        0.01       98.98
         69 |          1        0.01       98.99
         70 |         14        0.14       99.13
         71 |          7        0.07       99.20
         72 |          1        0.01       99.21
         80 |          2        0.02       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