Frequencies for first 10,000 rows of nochron variable in nhamcsopd2006 dataset :

 does patient now |
   have - none of |
       the listed |
          chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
               No |      4,842       48.42       48.42
              Yes |      4,832       48.32       96.74
Entire item blank |        326        3.26      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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