Frequencies for first 10,000 rows of payself variable in nhamcsopd2009 dataset :

   expected |
  source of |
   payment: |
   self pay |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,926       89.26       89.26
        yes |      1,074       10.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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