NA-DiD: Extending Difference-in-Differences with Capabilities
Abstract
This paper introduces the Non-Additive Difference-in-Differences (NA-DiD) framework, which extends classical DiD by incorporating non-additive measures the Choquet integral for effect aggregation. It serves as a novel econometric tool for impact evaluation, particularly in settings with non-additive treatment effects. First, we introduce the integral representation of the classial DiD model, and then extend it to non-additive measures, therefore deriving the formulae for NA-DiD estimation. Then, we give its theoretical properties. Applying NA-DiD to a simulated hospital hygiene intervention, we find that classical DiD can overestimate treatment effects, f.e. failing to account for compliance erosion. In contrast, NA-DiD provides a more accurate estimate by incorporating non-linear aggregation. The Julia implementation of the techniques used and introduced in this article is provided in the appendices.
Cite
@article{arxiv.2507.12690,
title = {NA-DiD: Extending Difference-in-Differences with Capabilities},
author = {Stanisław M. S. Halkiewicz},
journal= {arXiv preprint arXiv:2507.12690},
year = {2025}
}
Comments
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