Frequencies for first 10,000 rows of rf_cesar variable in natlterr2007 dataset :

   Previous |
   Cesarean |
 Deliveries |
        RFP |
593=f_rf_ce |
      sar R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,163       61.63       61.63
          N |      3,146       31.46       93.09
          U |          1        0.01       93.10
          Y |        690        6.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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