Frequencies for first 10,000 rows of nodisp variable in namcs2014 dataset :

 Visit disposition: no answer |
                      to item |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
One or more categories marked |      9,865       98.65       98.65
         No categories marked |        135        1.35      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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