Frequencies for first 10,000 rows of paytype variable in nhamcsopd2001 dataset :

 primary expected |
source of payment |      Freq.     Percent        Cum.
------------------+-----------------------------------
            Blank |        246        2.46        2.46
Private insurance |      2,587       25.87       28.33
         Medicare |      1,156       11.56       39.89
         Medicaid |      3,408       34.08       73.97
                4 |         73        0.73       74.70
         Self-pay |        827        8.27       82.97
        No charge |        624        6.24       89.21
            Other |        298        2.98       92.19
          Unknown |        781        7.81      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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