Frequencies for first 10,000 rows of paytype variable in nhamcsed2007 dataset :

      expected source of payment |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
all sources of payment are blank |        102        1.02        1.02
                         unknown |        500        5.00        6.02
               private insurance |      3,073       30.73       36.75
                        medicare |      1,411       14.11       50.86
                        medicaid |      2,949       29.49       80.35
           worker's compensation |        188        1.88       82.23
                        self-pay |      1,474       14.74       96.97
                       no charge |        113        1.13       98.10
                           other |        190        1.90      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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