Frequencies for first 10,000 rows of payself variable in namcs2009 dataset :

   self pay |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,495       94.95       94.95
        yes |        505        5.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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