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

 Type of payments |
accepted from new |
     patients: No |
   charge/Charity |      Freq.     Percent        Cum.
------------------+-----------------------------------
          Unknown |        686        6.86        6.86
   Not applicable |        327        3.27       10.13
              Yes |      4,319       43.19       53.32
               No |      4,668       46.68      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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