Frequencies for first 10,000 rows of sex variable in demo2006q4 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        571        5.71        5.71
          F |      5,083       50.83       56.54
          M |      4,234       42.34       98.88
         NS |         27        0.27       99.15
        UNK |         85        0.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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