Frequencies for first 10,000 rows of rf_cesar variable in natlterr2010 dataset :

   Previous |
   Cesarean |
 Deliveries |
        RFP |
593=f_rf_ce |
      sar R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,656       46.56       46.56
          N |      3,700       37.00       83.56
          U |        763        7.63       91.19
          Y |        881        8.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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