Frequencies for first 10,000 rows of sex variable in demo2012q2 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        852        8.52        8.52
          F |      5,292       52.92       61.44
          M |      3,841       38.41       99.85
        UNK |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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