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

      Cleft |
     Palate |
  alone RFP |
643=f_ca_cl |
      eft R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,997       99.97       99.97
          Y |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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