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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        918        9.18        9.18
          2 |         44        0.44        9.62
          3 |      1,059       10.59       20.21
          4 |      2,710       27.10       47.31
          5 |        105        1.05       48.36
          6 |      2,012       20.12       68.48
          7 |      3,090       30.90       99.38
          8 |         48        0.48       99.86
          9 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016