中文摘要：

本文对两水平无重复因析试验给出了散度效应的一种新的估计,称为AMH估计,改进了文献中散度效应的较好的MH估计的一个缺陷,给出并证明了AMH估计的无偏条件,证明了AMH估计比MH估计有更小的方差下界.最后通过模拟试验比较了AMH和MH估计的偏度,方差和均方误差.

英文摘要：

A new estimator of the dispersion effects,called the AMH,in two-level unreplicated factorial experiments is given.The AMH modifies a shortcoming of the MH estimator which was showed that there are many good properties in literatures.The unbiased condition of AMH is persented.We also prove that the AMH has more lower bound of variance than MH.Finally,the bias,variance and mean square error of AMH and MH are compared by simulated experiments.