Frequencies for first 10,000 rows of exercise variable in namcs2009 dataset :

   exercise |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,928       89.28       89.28
        yes |      1,072       10.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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