Frequencies for first 10,000 rows of nochron variable in nhamcsopd2008 dataset :

 does patient now |
have: none of the |
   listed chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      4,819       48.19       48.19
              yes |      4,968       49.68       97.87
entire item blank |        213        2.13      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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