Frequencies for sex variable in ncestagesexres dataset :

        Sex |      Freq.     Percent        Cum.
------------+-----------------------------------
      Total |        102       33.33       33.33
       Male |        102       33.33       66.67
     Female |        102       33.33      100.00
------------+-----------------------------------
      Total |        306      100.00

by Jean Roth , jroth@nber.org , 6 Nov 2017