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

       for new |
     patients, |
       accepts |
      self-pay |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         49        0.49        0.49
       unknown |        114        1.14        1.63
not applicable |        939        9.39       11.02
           yes |      8,719       87.19       98.21
            no |        179        1.79      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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