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

No provider |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,992       99.92       99.92
        Yes |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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