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

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,922       59.22       59.22
          2 |      2,785       27.85       87.07
          3 |      1,111       11.11       98.18
          4 |        137        1.37       99.55
          9 |         45        0.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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