查询词典 repeated sampling

Eight hierarchical clustering methods including single linkage method, complete linkage method, median linkage method, centroid method, unweighted pair-group average method, Wards method, flexible-beta method and weighted pair-group average method were combined with three sampling strategies, random, preferred and deviation sampling to develop 24-core collections.

川最短距离法、最长距离法、中间距离法、重心法、不加权类平均法、离差平方和法、可变法和加权配对算术平均法等8种系统聚类方法，结合随机取样法、优先取样法和变异度取样法等3种取样方法，发展了24个水稻核心种质库。

The method of sampling took Stratified Random Sampling. There are 240 valid questionnaires in 300, sum up to 80%.

本研究采取分层随机抽样法，共发放问卷300份，得有效问卷240份，有效问卷率为80%。

Based on the proportion estimate and the mean estimate in sampling technology,the authors of this paper put forward the method of ratio estimator in sampling technology and makes a detailed analysis of method.

在抽样技术比例估计与均值估计的基础上，提出了抽样技术的比率估计法，并对其作了详细的分析，同时，通过具体问题的讨论，说明了比率估计法所具有的优越性；针对各个样本比值有比较大的差别时所产生的不稳定性，运用聚类分析的方法提出了具体的比率估计法的改进公式，减少了噪声数据的影响，得到了较高的准确度。

Simple random sampling, two-phase sampling, auxiliary information, ratio estimator

| 简单随机抽样；二相抽样；辅助信息；比估计

RDS is a flexible and versatile sampling, which is fit for sampling hidden populations.

同伴推动抽样是一种灵活的、应用广泛的抽样方法，适合应用于隐蔽人群的抽样研究。

In chapter six"The problem of sampling and interpolating signal in noise", According to generalized sampling theorem one, An exponential weighting algorithms is proposed and error performance is analyzed, the results are development and complement of relative literature.

第六章"噪声中信号的内插恢复问题"中，针对广义采样定理一，提出了指数加权恢复算法，并对其性能进行了分析和计算，对有关文献中的结论作了补充和发展。

By the comparison of the variances in the whole process of analysis (the overall variance, the sampling variance and the sample analysis variance), a new concept named Critical Sampling Mass for well mixed bulk materials was presented, and the relative equation for calculating the CSM was derived.

通过对分析全过程中各个步骤的方差的统计分析，提出了临界取样量的概念和计算公式，探讨了取样的代表性问题，该项研究为客观上分析总方差所能达到的水平提供了理论依据。

Sampling designing based on spatial distribution and variability of soil properties is an important issue in recent studies on soil sampling.

利用土壤空间变异特性和空间分布特征进行采样设计是当前土壤采样研究的重要内容。

Methods The stratified random sampling rule and the standard grading system of blindness set by WHO were adopted in the study, and 11 327 subjects were enrolled (a sampling fraction of 2.01%) in the whole county.

采用分层随机抽样原则，以世界卫生组织盲目分级为标准，对全县按2.01%抽样比例抽取11327例进行盲和低视力的流行病学调查。

The two kinds of mistakes existing in sampling inspection are analyzed and the characteristics of two kinds of sampling inspection are discussed in the dissertation.

本文以概率论、数理统计为基础，分析了抽样检验两种错误的产生原因，论述了监督型抽检与验收型抽检的特点。

Metrorrhagia is also gynaecological problems of common diseases.

崩漏是妇科常见病也是疑难症。

WordFTP gives you the convenience and timesaving you need.

wordftp让您的方便和省时您所需要的。