Frequencies for dementia variable in snp2010 dataset :

   Dementia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,666       99.36       99.36
        Yes |         56        0.64      100.00
------------+-----------------------------------
      Total |      8,722      100.00

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