Frequencies for first 10,000 rows of csex variable in natl1979 dataset :

     Sex of |
      Child |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,995       49.95       49.95
          2 |      5,005       50.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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