Frequencies for first 10,000 rows of noprovid variable in namcs2013 dataset :

 Providers seen: no answer to |
                         item |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
One or more categories marked |      9,967       99.67       99.67
         No categories marked |         33        0.33      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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