Frequencies for first 10,000 rows of paymcare variable in nhamcsopd2007 dataset :

   expected |
  source of |
   payment: |
   medicare |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,111       81.11       81.11
        yes |      1,889       18.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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