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有时一致最有功效检验不存在，故只能退而求其次把要求放松一些，即一个合理的检验应具有这样的性质：当零假设成立时其被否定的概率，不应超过当零假设不成立时，零假设被否定的概率，我们把具有这样性质的检验称作无偏检验。如果假设检验是双边的，无偏检验为了照顾备择假设的两边，在其两边都没有达到最大功效，这也是无偏检验所付出的代价。
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unbiased test
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