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

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,035       60.35       60.35
          2 |      2,635       26.35       86.70
          3 |      1,162       11.62       98.32
          4 |         69        0.69       99.01
          9 |         99        0.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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