Frequencies for first 10,000 rows of ca_cchd variable in natlterr2007 dataset :

   Cyanotic |
 Congenital |
      Heart |
Disease RFP |
637=f_ca_he |
      art R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,163       61.63       61.63
          N |      3,831       38.31       99.94
          U |          1        0.01       99.95
          Y |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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