Frequencies for first 10,000 rows of sex variable in demo2006q1 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        421        4.21        4.21
          F |      5,070       50.70       54.91
          M |      4,455       44.55       99.46
         NS |          7        0.07       99.53
        UNK |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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