Frequencies for first 10,000 rows of paynochg variable in nhamcsed2012 dataset :

   Expected |
  source of |
payment: No |
     charge |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,958       99.58       99.58
        Yes |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016