Frequencies for first 10,000 rows of sex variable in demo2009q1 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,080       10.80       10.80
          F |      5,257       52.57       63.37
          M |      3,656       36.56       99.93
         NS |          3        0.03       99.96
        UNK |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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