本文给出了总体方差矩估计检验的样本崩溃点，并分析了该样本崩溃点的渐近正态性。
In this paper, We give the sample breakdown point of a test for moment estimation of population variance and analyze the asymptotically normal characteristic of the sample breakdown point.
结论 先找出住院费用和天数的总体分布 ，再合理选用以上四种方法估计出的总体均数和方差有更好的精度。
Results The four kinds of methods get the similar estimation when the length of stay and expense in hospital fit th…
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