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

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,069       60.69       60.69
          2 |      2,715       27.15       87.84
          3 |      1,040       10.40       98.24
          4 |        134        1.34       99.58
          9 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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