Frequencies for first 10,000 rows of rf_cesar variable in natlterr2015 dataset :

   Previous |
 Cesarean Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,078       10.78       10.78
          N |      7,403       74.03       84.81
          U |         57        0.57       85.38
          Y |      1,462       14.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016