Frequencies for first 10,000 rows of vaginal variable in natlterr1995 dataset :

    Vaginal |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,288       72.88       72.88
          2 |      2,711       27.11       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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