Frequencies for first 10,000 rows of fire_exp variable in vehicle dataset :

       FIRE |
 OCCURRENCE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,704       97.04       97.04
          1 |        296        2.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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