Frequencies for first 10,000 rows of sex variable in namcs2013 dataset :

Patient sex |      Freq.     Percent        Cum.
------------+-----------------------------------
     Female |      5,780       57.80       57.80
       Male |      4,220       42.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017