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

   expected |
  source of |
payment: no |
     charge |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,747       97.47       97.47
        yes |        253        2.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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