Frequencies for first 10,000 rows of csex variable in natl1987 dataset :

     Sex of |
      Child |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,109       51.09       51.09
          2 |      4,891       48.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016