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• W3156595930 abstract "High-dimensional limit theorems have been shown useful to derive tuning rules for finding the optimal scaling in random walk Metropolis algorithms. The assumptions under which weak convergence results are proved are, however, restrictive: the target density is typically assumed to be of a product form. Users may thus doubt the validity of such tuning rules in practical applications. In this paper, we shed some light on optimal scaling problems from a different perspective, namely a large-sample one. This allows to prove weak convergence results under realistic assumptions and to propose novel parameter-dimension-dependent tuning guidelines. The proposed guidelines are consistent with the previous ones when the target density is close to having a product form, and the results highlight that the correlation structure has to be accounted for to avoid performance deterioration if that is not the case, while justifying the use of a natural (asymptotically exact) approximation to the correlation matrix that can be employed for the very first algorithm run." @default.
• W3156595930 created "2021-04-26" @default.
• W3156595930 creator A5051873130 @default.
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• W3156595930 date "2022-02-18" @default.
• W3156595930 modified "2023-10-14" @default.
• W3156595930 title "Optimal scaling of random walk Metropolis algorithms using Bayesian large-sample asymptotics" @default.
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• W3156595930 doi "https://doi.org/10.1007/s11222-022-10080-8" @default.
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