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

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,757       57.57       57.57
          2 |      2,967       29.67       87.24
          3 |      1,083       10.83       98.07
          4 |        141        1.41       99.48
          9 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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