Frequencies for first 10,000 rows of sex variable in nhamcsopd2002 dataset :

patient sex |      Freq.     Percent        Cum.
------------+-----------------------------------
     Female |      6,477       64.77       64.77
       Male |      3,523       35.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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