Frequencies for chronicheartfailure variable in snp2012 dataset :

    Chronic |
      Heart |
    Failure |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,366       99.88       99.88
          * |          9        0.12      100.00
------------+-----------------------------------
      Total |      7,375      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016