Frequencies for first 10,000 rows of exercise variable in nhamcsopd2003 dataset :

   exercise |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,387       93.87       93.87
        yes |        613        6.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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