Frequencies for first 10,000 rows of vaginal variable in natl1990 dataset :

    Vaginal |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,564       75.64       75.64
          2 |      2,429       24.29       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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