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

    Traffic |
   Controls |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,277       72.77       72.77
          1 |         45        0.45       73.22
          2 |        604        6.04       79.26
          3 |        843        8.43       87.69
          4 |         27        0.27       87.96
          5 |         32        0.32       88.28
          6 |         37        0.37       88.65
          7 |         87        0.87       89.52
          8 |          2        0.02       89.54
          9 |         10        0.10       89.64
         98 |        980        9.80       99.44
         99 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016