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本来bootstrap好像懂了,看到书上表述又糊涂了,draws samples from the original sample,并且each individual resample has the same size as the original sample,那这样不是每次直接把original sample里面百分百都抽出来了吗,难道不应该是draws samples from the estimated population,然后original sample又是estimated population中的一部分吗?