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

       was health |
education ordered |
     or provided? |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      5,382       53.82       53.82
              yes |      4,396       43.96       97.78
entire item blank |        222        2.22      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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