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

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,219       52.19       52.19
          2 |      3,240       32.40       84.59
          3 |      1,035       10.35       94.94
          4 |         65        0.65       95.59
          5 |        322        3.22       98.81
          9 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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