Frequencies for first 10,000 rows of rf_cesar variable in natlterr2011 dataset :

   Previous |
   Cesarean |
 Deliveries |
        RFP |
593=f_rf_ce |
      sar R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      5,551       55.51       80.87
          U |      1,031       10.31       91.18
          Y |        882        8.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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