Frequencies for first 10,000 rows of nodisp variable in namcs2003 dataset :

visit disposition: no answer to |
                           item |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
One or more dispositions marked |      9,877       98.77       98.77
   No visit dispositions marked |        123        1.23      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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