Frequencies for first 10,000 rows of sex variable in demo2007q1 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        599        5.99        5.99
          F |      5,421       54.21       60.20
          M |      3,949       39.49       99.69
         NS |         10        0.10       99.79
        UNK |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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