Frequencies for first 10,000 rows of sex variable in demo2009q2 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,019       10.19       10.19
          F |      5,286       52.86       63.05
          M |      3,686       36.86       99.91
        UNK |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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