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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        997        9.97        9.97
          2 |      1,158       11.58       21.55
          3 |      3,006       30.06       51.61
          4 |      1,909       19.09       70.70
          5 |      2,802       28.02       98.72
          8 |         84        0.84       99.56
          9 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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