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

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,298       52.98       52.98
          2 |      2,607       26.07       79.05
          3 |      1,254       12.54       91.59
          4 |         45        0.45       92.04
          5 |        463        4.63       96.67
          6 |        181        1.81       98.48
          9 |        152        1.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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