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…
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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