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

    Traffic |
   Controls |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,739       77.39       77.39
          1 |         64        0.64       78.03
          2 |        635        6.35       84.38
          3 |        760        7.60       91.98
          4 |         30        0.30       92.28
          5 |         49        0.49       92.77
          6 |         37        0.37       93.14
          7 |         83        0.83       93.97
          8 |          3        0.03       94.00
          9 |         11        0.11       94.11
         98 |        536        5.36       99.47
         99 |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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