Frequencies for first 10,000 rows of nnochrge variable in namcs2009 dataset :

       for new |
     patients, |
    accepts no |
        charge |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        171        1.71        1.71
       unknown |        650        6.50        8.21
not applicable |        620        6.20       14.41
           yes |      3,438       34.38       48.79
            no |      5,121       51.21      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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