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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        994        9.94        9.94
          2 |      1,233       12.33       22.27
          3 |      2,982       29.82       52.09
          4 |      1,765       17.65       69.74
          5 |      2,953       29.53       99.27
          8 |         48        0.48       99.75
          9 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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