Frequencies for first 10,000 rows of paytype variable in nhamcsed2005 dataset :

      expected source of payment |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
all sources of payment are blank |        220        2.20        2.20
               private insurance |      3,354       33.54       35.74
                        medicare |      1,330       13.30       49.04
                  medicaid/schip |      2,730       27.30       76.34
           worker's compensation |        160        1.60       77.94
                        self-pay |      1,481       14.81       92.75
               no charge/charity |        175        1.75       94.50
                           other |        183        1.83       96.33
                         unknown |        367        3.67      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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