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

   expected |
  source of |
payment: no |
     charge |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,884       98.84       98.84
        yes |        116        1.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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