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Wasserstein Distributionally Robust Risk-Sensitive Estima...
[Submitted on 20 Apr 2026 (v1), last revised 29 Jun 2026 (this v · 2026-04-21 · via cs.LG updates on arXiv.org

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Abstract:We propose a distributionally robust approach to risk-sensitive estimation of an unknown signal x from an observed signal y. The observation and unknown signal are modeled as random vectors whose joint probability distribution is unknown, but assumed to belong to a given type-2 Wasserstein ball of distributions, termed the ambiguity set. The performance of an estimator is measured according to the conditional value-at-risk (CVaR) of the squared estimation error. Within this framework, we study the problem of computing affine estimators that minimize the worst-case CVaR over all distributions in the given ambiguity set. As our main result, we show that, when the nominal distribution at the center of the Wasserstein ball is finitely supported, such estimators can be exactly computed by solving a tractable semidefinite program. We evaluate the proposed estimators on a wholesale electricity price forecasting task using real market data and show that they deliver lower out-of-sample CVaR of squared error compared to existing methods.

Submission history

From: Feras Al Taha [view email]
[v1] Mon, 20 Apr 2026 17:39:18 UTC (164 KB)
[v2] Mon, 29 Jun 2026 20:21:46 UTC (164 KB)