Frequencies for first 10,000 rows of sex variable in demo2009q3 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        943        9.43        9.43
          F |      5,266       52.66       62.09
          M |      3,788       37.88       99.97
        UNK |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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