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

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,364       63.64       63.64
          2 |      2,333       23.33       86.97
          3 |      1,160       11.60       98.57
          4 |        101        1.01       99.58
          9 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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