Frequencies for first 10,000 rows of paydk variable in namcs2012 dataset :

   Expected |
  source of |
payment for |
     visit: |
    Unknown |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,752       97.52       97.52
        Yes |        248        2.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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