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

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,970       59.70       59.70
          2 |      2,712       27.12       86.82
          3 |      1,179       11.79       98.61
          4 |        100        1.00       99.61
          9 |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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