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Likelihood distortion and Bayesian local robustness
[Submitted on 24 May 2024 (v1), last revised 25 Jul 2026 (this v · 2024-05-24 · via stat updates on arXiv.org

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Abstract:Robust Bayesian analysis has been mainly devoted to detecting and measuring robustness w.r.t. the prior distribution. Many contributions in the literature aim to define suitable classes of priors which allow the computation of variations of quantities of interest while the prior changes within those classes. The literature has devoted much less attention to the robustness of Bayesian methods w.r.t. the likelihood function due to mathematical and computational complexity, and because it is often arguably considered a more objective choice compared to the prior. In this contribution, we propose a new approach to Bayesian local robustness, mainly focusing on robustness w.r.t. the likelihood function. Successively, we extend it to account for robustness w.r.t. the prior, as well as the prior and the likelihood jointly. This approach is based on the notion of distortion function introduced in the literature on risk theory. The novel robustness measure is a local sensitivity measure that turns out to be very tractable and easy to compute for several classes of distortion functions. Asymptotic properties are derived, and numerical experiments illustrate the theory and its applicability for modelling purposes.

Submission history

From: Antonio Di Noia [view email]
[v1] Fri, 24 May 2024 01:35:14 UTC (27 KB)
[v2] Sun, 2 Feb 2025 15:37:49 UTC (66 KB)
[v3] Thu, 5 Jun 2025 19:28:58 UTC (62 KB)
[v4] Tue, 2 Sep 2025 21:22:14 UTC (62 KB)
[v5] Sat, 25 Jul 2026 11:06:11 UTC (63 KB)