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I am learning general principles of sampling, in particular, importance sampling. I am looking for a good explanation for reweighting. Can anyone please explain when and why we need reweighting? What is the intuition behind reweighting in general? What does it accomplish?

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I am learning general principles of sampling, in particular, importance sampling. I am looking for a good explanation for reweighting. Can anyone please explain when and why we need reweighting? What is the intuition behind reweighting in general? What does it accomplish?	12