Frequencies for first 10,000 rows of exercise variable in namcs2007 dataset :

   exercise |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,969       89.69       89.69
        yes |      1,031       10.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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