Frequencies for first 10,000 rows of nselfpay variable in namcs2007 dataset :

       for new |
     patients, |
       accepts |
      self-pay |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         82        0.82        0.82
       unknown |        170        1.70        2.52
not applicable |        659        6.59        9.11
           yes |      8,873       88.73       97.84
            no |        216        2.16      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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