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

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,194       61.94       61.94
          2 |      2,564       25.64       87.58
          3 |      1,095       10.95       98.53
          4 |        109        1.09       99.62
          9 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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