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For different methods (moment solution and maximum likelihood estimation) and different models (homoscedastic and heteroscedastic models),more signifiant correlation was found between LOD scores than between the estimators of recombinant fraction ,Maximum likekihood method under homoscedastic model was then used to estimate recombinant fractions between quantitative trait lci controlling yield componments and 51 restriction fragment length polymorphism makers on 11 chromosomes of rice Oryza sativa L.

本研究根据对估计标记-数量性状基因座位之间重组率的两种分析方法、两种方差模型(QTL 基因型之间的方差同质和异质模型)的分析，揭示了LOD值在标记-QTL连锁检测上所得结果的相关性高于重组率估计值的相关性。

Two SNR estimators based on iteration method were developed in this paper.

该文提出了两种新的SNR的迭代求解方法。

There exist many literatures concerning the research that the biased estimators with certain restricted conditions outperform the least squares estimator under the criterion of the mean-square error.

2在均方误差准则下，满足一定约束条件的有偏估计优于最小二乘估计的研究相当多，在Pitman准则下的类似研究存在比较大的困难。

The simulation results show that probability weighted least squares estimator and Quasi-Aitken weighted least squares estimator are unbiased estimators of regression coefficients.

研究方法系采用Monte Carlo模拟方式模拟比较最小平方法、分层加权最小平方法、机率加权最小平方法及Quasi-Aitken机率加权最小平方法在分层不等机率抽样下的表现。

The alternative estimators used in this paper include least squares estimator, stratified weighted least squares estimator, probability weighted least squares estimator, and Quasi-Aitken weighted least squares estimator.

中文摘要抽样调查设计随著资讯需求的增加日益复杂，然若参数的估计方法无法配合所使用的抽样调查设计，则统计推论结果将难以达到预期的精确度。

In this paper,the relative efficiencies of three estimators with respect to the least squares estimate are shown.

本文给出了关于最小二乘估计的三种估计的相对效率，并研究了它们的性质以及与文献［2］讨论过的另一种相对效率的关系。

Concept of fault mapping function is presented, and the calculation processes of estimators of fault model parameters are proposed.

所提出的模型能够准确描述故障注入的基本原理，其应用算法是指导具体故障注入试验的行之有效的方法。

Also, it is deduced from the conclusions of maximum likelihood estimator that the performance of estimators is independent on source number if the number of snapshots used in estimator is large enough.

证明了它们在低信噪比情况下仍具有渐近无偏的估计性能；另外，利用最大似然估计器的相关结论，证明了在快拍数足够大的情况下，估计器的估计性能与信源数目的多少无关。

The empirical approximation methods can be applied to study uniform consistency, robustness, strong consistency of the maximum likelihood estimator of statistical estimators.

本文采用的经验逼近方法可应用于研究随机规划统计估计问题的一致相合性、稳健性、极大似然估计的强相合性。

Using the characteristic found,the maximum likelihood estimators and the moment estimator s of parameters of the multivariate exponential distribution of Freund are obtained.

利用分布密度分拆的思想，导出了二元及多元Freund型指数分布的一个特征，利用该特征，获得了二元及多元Freund型指数分布参数的最大似然估计及矩估计，还给出了强度服从二元Fre-und型指数分布时并联结构系统的可靠度估计及模拟。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。