Frequencies for first 10,000 rows of sex variable in nhamcsed1997 dataset :

patient sex |      Freq.     Percent        Cum.
------------+-----------------------------------
     Female |      5,204       52.04       52.04
       Male |      4,796       47.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016