Frequencies for first 10,000 rows of f_uca_heart variable in natl2004 dataset :

      Heart |
malformatio |
       ns U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          8        0.08        0.08
          1 |      9,992       99.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016