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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        932        9.32        9.32
          2 |         29        0.29        9.61
          3 |      1,112       11.12       20.73
          4 |      2,679       26.79       47.52
          5 |         95        0.95       48.47
          6 |      2,070       20.70       69.17
          7 |      3,026       30.26       99.43
          8 |         55        0.55       99.98
          9 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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