Frequencies for first 10,000 rows of nodisp variable in namcs2012 dataset :

 Visit disposition: no answer |
                      to item |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
One or more categories marked |      9,795       97.95       97.95
         No categories marked |        205        2.05      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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