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

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,281       52.81       52.81
          2 |      3,142       31.42       84.23
          3 |        984        9.84       94.07
          4 |         57        0.57       94.64
          5 |        413        4.13       98.77
          9 |        123        1.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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