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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        855        8.55        8.55
          2 |        147        1.47       10.02
          3 |      1,142       11.42       21.44
          4 |      2,909       29.09       50.53
          5 |        651        6.51       57.04
          6 |      1,951       19.51       76.55
          7 |      2,293       22.93       99.48
          8 |         45        0.45       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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