Frequencies for first 10,000 rows of repeac variable in natlterr1997 dataset :

     Repeat |
  C-section |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,271       12.71       12.71
          2 |      8,728       87.28       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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