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. Author manuscript; available in PMC: 2014 Jul 7.
Published in final edited form as: Eur J Health Econ. 2013 Feb 2;15(1):41–55. doi: 10.1007/s10198-012-0447-y

Appendix Figure A1. Willingness to stay free of sexually transmitted infections, verified by quarterly STI testing as a function of random quarterly incentive offers.

Appendix Figure A1

Notes: Non-parametric, locally-weighted regressions [31] with a sample of 1,645 individuals who stated their willingness-to-accept quarterly STI testing and a quarterly conditional economic incentive of USD$ α3 for staying free of sexually transmitted infections (STI). The line represents the proportion of individuals willing to accept the HIV prevention program. The dots represent (no/yes) responses, jittered for visualization purposes. The gray area reflects the 95% confidence intervals.