Frequencies for first 10,000 rows of nochron variable in nhamcsed2010 dataset :

     Does patient |
have: None of the |
            above |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      1,249       12.49       12.49
              yes |      8,054       80.54       93.03
entire item blank |        697        6.97      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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