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

   expected |
  source of |
   payment: |
    unknown |
  source of |
    payment |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,554       95.54       95.54
          1 |        446        4.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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