Frequencies for first 10,000 rows of sex variable in nhamcsopd2009 dataset :

patient sex |      Freq.     Percent        Cum.
------------+-----------------------------------
     female |      6,269       62.69       62.69
       male |      3,731       37.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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