Frequencies for first 10,000 rows of repeac variable in natlterr1998 dataset :

     Repeat |
  C-section |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,285       12.85       12.85
          2 |      8,713       87.13       99.98
          9 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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