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

       for new |
     patients, |
       accepts |
      self-pay |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         90        0.90        0.90
       unknown |         86        0.86        1.76
not applicable |        620        6.20        7.96
           yes |      8,879       88.79       96.75
            no |        325        3.25      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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