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

    TRAFFIC |
   CONTROLS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,354       73.54       73.54
          1 |         19        0.19       73.73
          2 |         89        0.89       74.62
          3 |        824        8.24       82.86
          4 |          8        0.08       82.94
          5 |         30        0.30       83.24
          6 |          7        0.07       83.31
          7 |          5        0.05       83.36
          8 |          5        0.05       83.41
          9 |          2        0.02       83.43
         20 |        823        8.23       91.66
         21 |         15        0.15       91.81
         28 |        427        4.27       96.08
         29 |          1        0.01       96.09
         30 |          7        0.07       96.16
         31 |          1        0.01       96.17
         39 |          2        0.02       96.19
         40 |        235        2.35       98.54
         50 |         12        0.12       98.66
         60 |         13        0.13       98.79
         61 |          8        0.08       98.87
         62 |          2        0.02       98.89
         70 |         14        0.14       99.03
         71 |         12        0.12       99.15
         80 |          1        0.01       99.16
         99 |         84        0.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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