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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,084       70.84       70.84
          1 |         14        0.14       70.98
          2 |        109        1.09       72.07
          3 |        748        7.48       79.55
          4 |        153        1.53       81.08
          5 |         16        0.16       81.24
          6 |         14        0.14       81.38
          7 |          4        0.04       81.42
          8 |          9        0.09       81.51
          9 |         15        0.15       81.66
         20 |        871        8.71       90.37
         21 |          8        0.08       90.45
         28 |        599        5.99       96.44
         29 |          1        0.01       96.45
         39 |          4        0.04       96.49
         40 |        199        1.99       98.48
         50 |          2        0.02       98.50
         60 |         18        0.18       98.68
         61 |         15        0.15       98.83
         62 |          1        0.01       98.84
         70 |         18        0.18       99.02
         71 |          6        0.06       99.08
         72 |          3        0.03       99.11
         79 |          1        0.01       99.12
         80 |          6        0.06       99.18
         98 |          7        0.07       99.25
         99 |         75        0.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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