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

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,286       52.86       52.86
          2 |      2,305       23.05       75.91
          3 |      1,424       14.24       90.15
          4 |         62        0.62       90.77
          5 |        513        5.13       95.90
          6 |        189        1.89       97.79
          9 |        221        2.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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