Frequencies for first 10,000 rows of sex variable in demo2006q2 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        351        3.51        3.51
          F |      5,083       50.83       54.34
          M |      4,531       45.31       99.65
         NS |          5        0.05       99.70
        UNK |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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