Frequencies for first 10,000 rows of vaginal variable in natlterr2000 dataset :

    Vaginal |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,182       61.82       61.82
          2 |      3,817       38.17       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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