分层抽样

In this paper, the regression estimation for multivariate simple random sampling and stratified sampling is discussed, it is proved that this method is more available than the estimation without auxiliary variable, and some statistical inferences of population mean are given.

文章系统地讨论了多元简单随机抽样及分层抽样的回归估计法，说明与无辅助信息抽样相比，回归估计法是一种更有效的方法，并得出了总体均值的一些统计推断。

Methods The study was conducted by cluster sampling and stratified sampling.

采用整群抽样和分层抽样相结合的调查方法。

For stratified and cluster sampling with inappreciable differences, estimate precision becomes poor.

对于分层抽样和整群抽样，当群体间的差异、群内个体间差异均不显著时，其估计精度往往都很差。

The main research and application result is: five dynamic sampling frames with spatial autocorrelation analysis are achieved such as high-high, low-low, high-low, low-high and not significant, and finally the result of per capita agricultural total output value of Beijing with spatial stratified sampling technique is 35.80 thousand Yuan RMB, with the sampling error range is ±3.861 thousand Yuan RMB.

其结果为：动态生成"高－高集聚"、"低－低集聚"、"高－低集聚"、"低－高集聚"和"分布不明显"5个抽样框，并最终通过空间分层抽样流程得到北京市人均农业总产值的抽样调查结果为3.580万元，抽样误差的允许范围为±0.3861万元。

The survey conducted in Taiwan was designed using a multiple-stage sampling method that utilized the principles of probabilities proportional to size, stratified sampling, and systematic sampling to strengthen the sample's effective representation.

为符合研究的需要，本次研究的抽样方法采取较复杂的多阶段抽样法，主要应用「抽取率与单位大小成比例」原则，结合分层抽样、等距抽样等抽样方法的优点，以求提高样本代表性。

Excepting the conventional methods of surveying samples, such as simple random sampling, stratified sampling, cluster sampling, systematic sampling, liner regression sampling, ratio estimator, two-stage sampling, double sampling, rotate sampling, non-probability sampling, there is sequential sampling and mark-recapture, particularly mark-recapture was introduced in detail.

针对生物资源的调查，除了一般抽样方法如：简单随机抽样、分层抽样、整群抽样、系统抽样、双重抽样、二阶抽样、样本轮换、比率估计、线性回归抽样和不等概抽样，还有序贯抽样和标记-重捕获方法，这里特别详细介绍了标记-重捕获方法。

Simple random sampling; stratification ; ratio and regression estimates; systematic sampling, subsampling; cost functions and choice of optimal design; estimation procedures.

简单随机抽样，分层抽样、比率和回归估计，系统抽样、次级抽样，成本函数与最优设计选择；估计过程。

This text proceed from this promptly, discuss Stratified Sampling application and sample assessment of result of method mainly, Pass to some profit and tax amount sample investigation design of method, enterprise of shopping center, Probe into and divide layer sample actual application of technology further.

本文即从这一点出发，主要讨论分层抽样的基本方法以及抽样效果的评估，并通过对某商业区企业利税额抽样调查方法的设计，进一步探讨分层抽样技术的实际运用。

At present,the methods of random sampling,systematic sampling and stratified sampling are widely used in remote sensing sampling.

目前，随机抽样、系统抽样和分层抽样方式在遥感抽样调查技术领域应用比较广泛。

In chapter 8, we discuss admissibility of strict Pi ps sampling scheme in a class of unequal probability without replacement sampling scheme presented by R.R.

第四章在前两章的基础上，讨论了整群抽样和分层抽样均含有辅助信息是时，补充辅助样本抽样方案的精度。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。