Frequencies for first 10,000 rows of paytype variable in nhamcsed2006 dataset :

      expected source of payment |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
all sources of payment are blank |        110        1.10        1.10
               private insurance |      3,574       35.74       36.84
                        medicare |      1,354       13.54       50.38
                  medicaid/schip |      2,685       26.85       77.23
           worker's compensation |        168        1.68       78.91
                        self-pay |      1,480       14.80       93.71
               no charge/charity |        110        1.10       94.81
                           other |        191        1.91       96.72
                         unknown |        328        3.28      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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