Frequencies for chronicheartfailure variable in snp2013 dataset :

    Chronic |
      Heart |
    Failure |      Freq.     Percent        Cum.
------------+-----------------------------------
            |     11,861       99.82       99.82
          * |         21        0.18      100.00
------------+-----------------------------------
      Total |     11,882      100.00

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