Frequencies for first 10,000 rows of sex variable in demo2011q4 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        647        6.47        6.47
          F |      5,775       57.75       64.22
          M |      3,572       35.72       99.94
        UNK |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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