Frequencies for first 10,000 rows of sex variable in nhamcsopd1997 dataset :

patient sex |      Freq.     Percent        Cum.
------------+-----------------------------------
     Female |      6,504       65.04       65.04
       Male |      3,496       34.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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