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Past exam of the mathematics course of the University of Cambridge / 2025 / iii / Paper 219 / 4 / d

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2025 iii Paper 219 4
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Estimate each one-dimensional marginal posterior from its individual experiment's weighted samples, for example by weighted kernel density estimation. Combining that density estimate with the individual evidence estimate gives
f​A​(θ)=π(θ)ZA​PA​(θ)​,f​B​(θ)=π(θ)ZB​PB​(θ)​.
(1)
Their product with π(θ) can be normalized on the one-dimensional θ space, avoiding all joint nuisance-parameter sampling.

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