Frequencies for first 10,000 rows of nochron variable in namcs2013 dataset :

 Does patient now |
have: None of the |
            above |      Freq.     Percent        Cum.
------------------+-----------------------------------
               No |      5,500       55.00       55.00
              Yes |      4,198       41.98       96.98
Entire item blank |        302        3.02      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017