Frequencies for first 10,000 rows of nnochrge variable in namcs2006 dataset :

       for new |
     patients, |
     physician |
   accepts: no |
        charge |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        231        2.31        2.31
           yes |      3,841       38.41       40.72
            no |      4,432       44.32       85.04
       unknown |        889        8.89       93.93
not applicable |        607        6.07      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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