Frequencies for first 10,000 rows of nodisp variable in nhamcsed2005 dataset :

          no answer to disposition item |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
one or more answers to the disposition  |      9,863       98.63       98.63
      no answer to the disposition item |        137        1.37      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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