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

   Expected source of payment |
 for visit: No answer to item |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
One or more categories marked |      9,872       98.72       98.72
         No categories marked |        128        1.28      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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