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

    Traffic |
    Control |
     Device |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,824       78.24       78.24
          1 |         14        0.14       78.38
          2 |         65        0.65       79.03
          3 |        645        6.45       85.48
          4 |         21        0.21       85.69
          5 |         16        0.16       85.85
          6 |          8        0.08       85.93
          7 |          6        0.06       85.99
          8 |          7        0.07       86.06
          9 |         10        0.10       86.16
         20 |        807        8.07       94.23
         21 |         14        0.14       94.37
         28 |         65        0.65       95.02
         29 |          2        0.02       95.04
         30 |          1        0.01       95.05
         40 |        396        3.96       99.01
         50 |         15        0.15       99.16
         60 |         14        0.14       99.30
         61 |         16        0.16       99.46
         62 |          1        0.01       99.47
         63 |          1        0.01       99.48
         69 |          3        0.03       99.51
         70 |         25        0.25       99.76
         71 |          3        0.03       99.79
         78 |          1        0.01       99.80
         99 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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