Frequencies for first 10,000 rows of nochron variable in nhamcsopd2010 dataset :

 does patient now |
have: none of the |
   listed chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      5,594       55.94       55.94
              yes |      4,202       42.02       97.96
entire item blank |        204        2.04      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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