Frequencies for fire_exp variable in vehnit dataset :

       FIRE |
 OCCURRENCE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,453       98.11       98.11
          1 |         28        1.89      100.00
------------+-----------------------------------
      Total |      1,481      100.00

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