Frequencies for first 10,000 rows of exercise variable in nhamcsopd2011 dataset :

   Exercise |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,160       91.60       91.60
        Yes |        840        8.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016