Frequencies for first 10,000 rows of ca_cchd variable in natlterr2010 dataset :

   Cyanotic |
 Congenital |
      Heart |
Disease RFP |
637=f_ca_he |
      art R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,656       46.56       46.56
          N |      4,363       43.63       90.19
          U |        973        9.73       99.92
          Y |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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