Frequencies for first 10,000 rows of sex variable in demo2008q4 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        767        7.67        7.67
          F |      5,673       56.73       64.40
          M |      3,545       35.45       99.85
         NS |          4        0.04       99.89
        UNK |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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