A kind of nonlinear regression estimator for limited Population is given and the quality and the sampling variance about is discussed.
对有限总体在不放回抽样的方法下，构造了一类非线性回归估计量，讨论了它的性质及其有关抽样误差．。
It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.
实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。
Distance between dots should be uniform in the field measurement. Sampling number should be estimated by certain believe level, estimate accuracy and variance coefficient.
田间测墒时，点与点之间的距离要均匀，取样数目可以根据一定的置信水平、估值精度、变异系数做估算。
In this paper it not only gives the method of unequal probability in group sampling and unbiassedness of mean estimation and also gives the variance and its unbiassedness of estimation.
本文给出了集团抽样的不等概方法和均值的无偏估计，同时也给出了这种估计的方差及方差的无偏估计。
This paper proposes Latin hypercube sampling combined with variance reduction techniques of conditional expectation and antithetic variates to assess ultimate strength reliability of ship hull girder.
本文将拉丁超立方抽样法与条件期望和对偶变数方差减缩技术组合用于分析船体总纵极限强度可靠性。
Comparative study on random sampling and Latin hypercube sampling with and without variance reduction techniques is carried out to a number of different limit state functions.
在一系列不同的极限状态函数条件下，对随机抽样法和拉丁超立方抽样法以及是否使用方差减缩技术进行了比较研究。
The results show the importance of the stability and smaller variance of the statistical characteristics of the atmosphere during the sampling.
实验结果表明，取样期间大气统计特性不变和小方差条件的重要性。
Influence of rotational speed on the time-dependent displacement response variance and influence of sampling frequency on the time-dependent displacement response variance curve are discussed.
讨论了不同转速对位移响应时变方差的影响和不同采样角频率对位移响应时变方差曲线的影响。
Importance sampling technique is an effective variance reduction technique in Monte Carlo simulation method for pricing options.
在期权定价的蒙特卡罗模拟中，重要性抽样是一种有效的方差减小技术。
This paper studies reliability sampling inspection method for items whose quality characteristic has a normal distribution with an unknown variance under double combined specification limits.
在综合双侧规格限下研究方差未知的正态分布产品可靠性抽样检验方法。
The traditional way is to obtain the sub-image by sampling the noised image in spatial or frequency domain, then calculate its variance to replace that of the original noise.
传统方法是通过空域或频域采样，得到该子噪声图像，然后直接对其估计方差，它对图像信息的分布有要求。
Methods:6 specimen squares were investigated and analyzed by using analysis of variance to determine appropriate sampling areas of Microtus fuscus ;
方法：调查6种样方，进行方差分析，以确定适宜青海田鼠抽样的样方面积；
These percentage of variance difference through sampling at 15% and 10% were higher than that of through sampling at 25%.
按15%和10%的抽样比例得到的核心库的方差差异百分率相等而高于25%抽样比例的方差差异百分率；
Calculation variance can be reduced by multiple important sampling technique, and then calculation efficiency can be improved.
复合重要抽样可以减小计算方差，提高计算效率。
We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.
讨论多阶段抽样比率估计及其样本量选择的问题，给出了比率估计抽样均方误差的近似公式及其渐近无偏估计的公式。
Focus in data quality assessment is non-sampling errors and variance, in addition to sampling errors.
在数据质量评估中，我们除对抽样误差进行检查外，重点是对非抽样误差和偏差的检查。
Method Cochran's classic sampling theo- ries, the improved randomized response technique(RRT) model, total probability formulas and properties of variance were used in this paper.
本文在随机截尾模型的基础上，为了提高回答者的合作程度，提出了两种改进的调查敏感性问题数量特征的随机化回答方法。
Method Cochran's classic sampling theo- ries, the improved randomized response technique(RRT) model, total probability formulas and properties of variance were used in this paper.
本文在随机截尾模型的基础上，为了提高回答者的合作程度，提出了两种改进的调查敏感性问题数量特征的随机化回答方法。
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