Frequencies for first 10,000 rows of nochron variable in nhamcsed2011 dataset :

     Does patient |
have: None of the |
            above |      Freq.     Percent        Cum.
------------------+-----------------------------------
               No |      1,302       13.02       13.02
              Yes |      7,896       78.96       91.98
Entire item blank |        802        8.02      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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