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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        719        7.19        7.19
          2 |        326        3.26       10.45
          3 |      1,301       13.01       23.46
          4 |      2,753       27.53       50.99
          5 |         47        0.47       51.46
          6 |      2,120       21.20       72.66
          7 |      2,612       26.12       98.78
          8 |         36        0.36       99.14
          9 |         86        0.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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