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

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,285       62.85       62.85
          2 |      2,392       23.92       86.77
          3 |      1,169       11.69       98.46
          4 |        104        1.04       99.50
          9 |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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