Frequencies for first 10,000 rows of sex variable in demo2008q1 dataset :

   Code for |
  patient's |
        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        702        7.02        7.02
          F |      5,489       54.89       61.91
          M |      3,805       38.05       99.96
         NS |          1        0.01       99.97
        UNK |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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