Frequencies for first 10,000 rows of f_ca_heart variable in natl2010 dataset :

   Cyanotic |
 Congenital |
      Heart |
    Disease |
(ca_cchd) R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,983       99.83       99.83
          1 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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