Frequencies for pfire variable in parkwork dataset :

       Fire |
 Occurrence |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        989       98.70       98.70
          1 |         13        1.30      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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