Frequencies for first 10,000 rows of ca_cchd variable in natlterr2005 dataset :

   Cyanotic |
 Congenital |
      Heart |
  Disease R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,255       62.55       62.55
          N |      3,738       37.38       99.93
          Y |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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