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On the robustness of posterior means

Jiafeng Chen

arXiv 15 Mar 2023 · Mathematics — Statistics Theory

arXiv:2303.08653 · PDF · DOI · OpenAlex · Extracted main text

Abstract

Consider a normal location model $X \mid \theta \sim N(\theta, \sigma^2)$ with known $\sigma^2$. Suppose $\theta \sim G_0$, where the prior $G_0$ has zero mean and variance bounded by $V$. Let $G_1$ be a possibly misspecified prior with zero mean and variance bounded by $V$. We show that the squared error Bayes risk of the posterior mean under $G_1$ is bounded, subjected to an additional tail condition on $G_1$, uniformly over $G_0, G_1, \sigma^2 > 0$.

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Most heavily cited references

The works this paper leans on most, across its whole bibliography — not restricted to papers in our corpus. Ranked by composite intensity, which combines how often a work is mentioned, how many sections mention it, and how much of that falls in the main text rather than the appendix.

ReferenceIntensityMentionsSectionsMain text
1Jiang, W (2020) On general maximum likelihood empirical bayes estimation of heteroscedastic iid normal means0.40511100%

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