Frequencies for cl_tway variable in accident dataset :

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          9        1.85        1.85
          3 |        332       68.31       70.16
          4 |         70       14.40       84.57
          5 |         74       15.23       99.79
          8 |          1        0.21      100.00
------------+-----------------------------------
      Total |        486      100.00

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