Frequencies for first 10,000 rows of payself variable in nhamcsed2008 dataset :

   self pay |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,305       83.05       83.05
        yes |      1,695       16.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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