Frequencies for first 10,000 rows of f_u_vag variable in natlterr2008 dataset :

    Vaginal |
(ume_vag) U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,277       52.77       52.77
          1 |      4,723       47.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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