Frequencies for first 10,000 rows of paypriv variable in nhamcsopd2005 dataset :

   expected |
  source of |
   payment: |
    private |
  insurance |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,172       71.72       71.72
        yes |      2,828       28.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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