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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,016       10.16       10.16
          2 |      1,221       12.21       22.37
          3 |      2,841       28.41       50.78
          4 |      1,917       19.17       69.95
          5 |      2,939       29.39       99.34
          8 |         59        0.59       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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