Frequencies for first 10,000 rows of typepay variable in nhamcsed1995 dataset :

         type of payment for this visit |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
No answer, both parts a and b were blan |        224        2.24        2.24
              Preferred Provider Option |        745        7.45        9.69
               Insured, fee-for-service |      3,638       36.38       46.07
                      HMO/Other prepaid |      2,059       20.59       66.66
                               Self-pay |      1,761       17.61       84.27
                              No charge |         40        0.40       84.67
                                  Other |        312        3.12       87.79
Type of payment unspec, but insurance c |      1,221       12.21      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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