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

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,616       56.16       56.16
          2 |      3,449       34.49       90.65
          3 |        806        8.06       98.71
          4 |         51        0.51       99.22
          9 |         78        0.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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