Frequencies for first 10,000 rows of payself variable in namcs2007 dataset :

   self pay |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,316       93.16       93.16
        yes |        684        6.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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