Frequencies for first 10,000 rows of stresmgt variable in nhamcsopd2009 dataset :

     stress |
 management |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,779       97.79       97.79
        yes |        221        2.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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