Frequencies for first 10,000 rows of nochron variable in namcs2008 dataset :

 does patient now |
have: none of the |
   listed chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      5,136       51.36       51.36
              yes |      4,693       46.93       98.29
entire item blank |        171        1.71      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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