Frequencies for first 10,000 rows of paytype variable in nhamcsopd2007 dataset :

    expected source of payment - |
            hierarchical version |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
all sources of payment are blank |        101        1.01        1.01
                         unknown |        844        8.44        9.45
               private insurance |      2,711       27.11       36.56
                        medicare |      1,531       15.31       51.87
                        medicaid |      3,385       33.85       85.72
           worker's compensation |         73        0.73       86.45
                        self-pay |        679        6.79       93.24
                       no charge |        516        5.16       98.40
                           other |        160        1.60      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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