Frequencies for first 10,000 rows of sex variable in demo2007q3 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        466        4.66        4.66
          F |      5,660       56.60       61.26
          M |      3,861       38.61       99.87
         NS |          1        0.01       99.88
        UNK |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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