Frequencies for first 10,000 rows of nnochrge variable in namcs2008 dataset :

       for new |
     patients, |
    accepts no |
        charge |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         22        0.22        0.22
       unknown |        930        9.30        9.52
not applicable |        939        9.39       18.91
           yes |      3,743       37.43       56.34
            no |      4,366       43.66      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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