Frequencies for first 10,000 rows of eniflag3 variable in mort1975 dataset :

   eniflag3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,735       67.35       67.35
          1 |        102        1.02       68.37
          . |      3,163       31.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015