Frequencies for first 10,000 rows of paynochg variable in nhamcsed2009 dataset :

   expected |
  source of |
payment: no |
     charge |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,883       98.83       98.83
          1 |        117        1.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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