The Horseshoe prior yields asymptotically minimax optimal predictive Bayes estimators in sparse Gaussian models, with hierarchical extensions enabling adaptive switching and sharper risk bounds under a theta-min condition.
37 Proof.By Lemma 2.1 of Ročková (2023), For any priorπ(θ), ρ(θ,ˆp) =θ2 2r−EθlogNθ,v(Z) +E θlogNθ,1(Z),(A.6) where Nθ,v(Z) = ∫ R exp { µZ√v + µθ v −µ2 2v } π(µ) dµ, andv−1= 1 +r−1
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Horseshoe Predictive Inference
The Horseshoe prior yields asymptotically minimax optimal predictive Bayes estimators in sparse Gaussian models, with hierarchical extensions enabling adaptive switching and sharper risk bounds under a theta-min condition.