Frequencies for first 10,000 rows of nnochrge variable in namcs2010 dataset :

       for new |
     patients, |
    accepts no |
        charge |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         36        0.36        0.36
       unknown |        839        8.39        8.75
not applicable |        722        7.22       15.97
           yes |      3,612       36.12       52.09
            no |      4,791       47.91      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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