Frequencies for first 10,000 rows of sex variable in natl2007 dataset :

     Sex of |
 Infant U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          F |      4,880       48.80       48.80
          M |      5,120       51.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015