Frequencies for first 10,000 rows of sex variable in demo2005q2 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        505        5.05        5.05
          F |      5,273       52.73       57.78
          M |      4,103       41.03       98.81
         NS |          4        0.04       98.85
        UNK |        115        1.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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