Frequencies for first 10,000 rows of sex variable in demo2006q3 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        432        4.32        4.32
          F |      5,428       54.28       58.60
          M |      4,078       40.78       99.38
         NS |         15        0.15       99.53
        UNK |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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