Frequencies for first 10,000 rows of nselfpay variable in namcs2011 dataset :

       Type of |
       payment |
 accepted from |
 new patients: |
      Self-pay |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |        133        1.33        1.33
       Unknown |        232        2.32        3.65
Not applicable |        583        5.83        9.48
           Yes |      8,714       87.14       96.62
            No |        338        3.38      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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