Frequencies for first 10,000 rows of paydk variable in nhamcsed2015 dataset :

   Expected |
  source of |
   payment: |
    Unknown |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,263       92.63       92.63
        Yes |        737        7.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017