Frequencies for sur_cond variable in accident dataset :

    Roadway |
    Surface |
  Condition |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        453       79.33       79.33
          2 |        117       20.49       99.82
          9 |          1        0.18      100.00
------------+-----------------------------------
      Total |        571      100.00

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