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Matching and weighting in stated preferences for health care

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  • Vass, Caroline M.
  • Boeri, Marco
  • Poulos, Christine
  • Turner, Alex J.

Abstract

There is an increasing interest in the use of stated preference methods to understand individuals' preferences for health and healthcare. There is also a growing interest in understanding heterogeneity in individuals' preferences. Consequently, stated preference studies frequently consider models that capture either or both observed and unobserved preference heterogeneity. A popular preliminary investigation into heterogeneity involves split-sample analysis to compare subgroups' preferences e.g., comparing patients with clinicians, or older patients with younger. In fixed-effects models, the constant variables (the individuals’ characteristics) remain stable across choice sets and therefore only enter the choice model when interacted with various attributes and/or levels. However, subgroups of respondents may differ on multiple variables that may not easily be implemented with interaction terms because of complexity and a lack of power thus only one, or a few, variables are typically taken into account in each subgroup model. This paper presents an overview of methods for matching and balancing samples to weight individuals with different characteristics in subgroup analysis and an example of how unweighted comparisons may produce erroneous conclusions regarding the degree of heterogeneity in preferences. We illustrate the issue with synthetic and empirical datasets to explore methods for matching subgroups before and within simple choice models. Our results show that entropy balancing and propensity score matching could be more appropriate than analyses using unmatched preference data when heterogeneity is driven by multiple factors. The paper concludes with a discussion of when matching and weighting may and may not be useful in healthcare decision-making.

Suggested Citation

  • Vass, Caroline M. & Boeri, Marco & Poulos, Christine & Turner, Alex J., 2022. "Matching and weighting in stated preferences for health care," Journal of choice modelling, Elsevier, vol. 44(C).
    • Handle: RePEc:eee:eejocm:v:44:y:2022:i:c:s1755534522000252
    DOI: 10.1016/j.jocm.2022.100367
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    References listed on IDEAS

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