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

 Providers seen: no answer to |
                         item |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
One or more categories marked |      9,965       99.65       99.65
         No categories marked |         35        0.35      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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