Frequencies for dementia variable in snp2011 dataset :

   Dementia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,272       99.15       99.15
          * |         54        0.85      100.00
------------+-----------------------------------
      Total |      6,326      100.00

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