Frequencies for first 10,000 rows of ld_indl variable in natl2013 dataset :

  Induction |
   of Labor |
        RFP |
608=f_ld_in |
     duct R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      7,180       71.80       71.80
          U |        153        1.53       73.33
          Y |      2,667       26.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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