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Published on: September 19, 2012
Comparing welfare estimates from payment card contingent valuation and discrete choice experiments
1Health Economics Research Unit, Institute of Applied Health Sciences, University of Aberdeen, Foresterhill, Aberdeen, UK. m.ryan@abdn.ac.uk
Health Economics
|August 5, 2008
Summary
This study compared two methods for estimating willingness to pay for Chlamydia screening, finding the discrete choice experiment (DCE) yielded higher estimates than the payment card (PC) method. Both methods showed theoretical validity but differed in real-world screening uptake.
Area of Science:
- Health Economics
- Public Health
- Survey Methodology
Background:
- Accurate estimation of willingness to pay (WTP) is crucial for health policy and resource allocation.
- Contingent valuation (CV) methods, such as payment card (PC) and discrete choice experiment (DCE), are commonly used to elicit WTP.
- Direct comparisons of PC and DCE methods for specific health interventions like Chlamydia screening are limited.
Purpose of the Study:
- To conduct the first direct comparison of WTP estimates derived from the PC and DCE methods.
- To assess the validity and reliability of WTP estimates from both methods in the context of Chlamydia screening preferences among women.
- To investigate potential reasons for discrepancies in WTP estimates between the two stated preference methods.
Main Methods:
- A within-sample experiment was conducted to elicit women's preferences and WTP for Chlamydia screening using both PC and DCE methodologies.
- Theoretical validity tests, including non-satiation and prominence effect assessments, were applied to the collected data.
- Stated preference data from both methods were compared against revealed preference data on actual screening uptake.
Main Results:
- The DCE method generated a significantly larger WTP estimate compared to the PC method.
- Both PC and DCE methods demonstrated theoretical validity, with no significant difference in reported task difficulty.
- Evidence of a prominence effect was observed in PC responses, while DCE responses met non-satiation criteria.
Conclusions:
- The choice of stated preference method (PC vs. DCE) can significantly influence WTP estimates for health interventions.
- While both methods showed theoretical validity, differences in response patterns (e.g., prominence effect in PC) may explain estimate variations.
- Further research is needed to improve the external validity of stated preference methods by aligning stated intentions with actual health behaviors.
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