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

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,538       55.38       55.38
          2 |      2,458       24.58       79.96
          3 |      1,214       12.14       92.10
          4 |         35        0.35       92.45
          5 |        478        4.78       97.23
          6 |        186        1.86       99.09
          9 |         91        0.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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