Frequencies for first 10,000 rows of sex variable in nhamcsed2012 dataset :

Patient sex |      Freq.     Percent        Cum.
------------+-----------------------------------
     Female |      5,425       54.25       54.25
       Male |      4,575       45.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016