Frequencies for first 10,000 rows of sex variable in demo2005q3 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        466        4.66        4.66
          F |      5,281       52.81       57.47
          M |      4,183       41.83       99.30
        UNK |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015