Frequencies for first 10,000 rows of sex variable in demo2004q3 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        539        5.39        5.39
          F |      5,283       52.83       58.22
          M |      4,071       40.71       98.93
         NS |         12        0.12       99.05
        UNK |         95        0.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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