Frequencies for first 10,000 rows of csex variable in natl1981 dataset :

     Sex of |
      Child |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,931       49.31       49.31
          2 |      5,069       50.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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