Frequencies for first 10,000 rows of nochron variable in nhamcsopd2005 dataset :

 does patient now |
   have - none of |
       the listed |
          chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      4,616       46.16       46.16
              yes |      4,868       48.68       94.84
entire item blank |        516        5.16      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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