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

       FIRE |
 OCCURRENCE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,667       96.67       96.67
          1 |        333        3.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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