Frequencies for first 10,000 rows of sex variable in demo2005q1 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        353        3.53        3.53
          F |      5,895       58.95       62.48
          M |      3,699       36.99       99.47
         NS |          5        0.05       99.52
        UNK |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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