Frequencies for first 10,000 rows of nodisp variable in nhamcsed2012 dataset :

          No answer to disposition item |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
One or more answers to the disposition  |      9,970       99.70       99.70
      No answer to the disposition item |         30        0.30      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016