Frequencies for chronicheartfailure variable in snp2011 dataset :

    Chronic |
      Heart |
    Failure |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,301       99.60       99.60
          * |         25        0.40      100.00
------------+-----------------------------------
      Total |      6,326      100.00

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