Frequencies for first 10,000 rows of vaginal variable in natl1989 dataset :

    Vaginal |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,395       73.95       73.95
          2 |      2,546       25.46       99.41
          9 |         59        0.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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