Frequencies for first 10,000 rows of repeac variable in natlterr1999 dataset :

     Repeat |
  C-section |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,297       12.97       12.97
          2 |      8,700       87.00       99.97
          9 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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