简单随机抽样

本文在PPS抽样方案和有效回简单随机抽样方案的情形下构造了这两种估计并精确比较了它们的优劣。

Two kinds of estimators were compared under PPS sampling and simple random sampling with replacement .

PPS放回抽样方案下对总体均值的估计与简单随机抽样方案下对总体均值的乘积估计是实际应用相当广泛的两种抽样方法。

The estimation for the population mean under PPS sampling scheme and the product estimation for population mean under simple random sampling scheme are two often methods in practice . Their theoretical research is very rich too .

二阶、三阶简单随机抽样时均值函数的jackknife估计

Jackknife Estimation of Functions of Means in Two-stage and Three-stage Simple Random Sampling Multivariate Populations

随着社会的发展，传统的简单随机抽样（SRS）方法已不再能满足人们的实际需要。

With the development of the society , traditional sampling method cann ` t satisfy the practice need of the human being any longer .

方法：对学校学生分布调查分析，用多阶段、先整群后简单随机抽样方法从12座民工子弟小学各年级段中随机抽取240名学生，进行IgG抗体测定和调查。

Methods One sample of 240 students was recruited using a multistage cluster sampling design from 12 elementary school of migrant laborers ' children . Measles antibody IgG testing and questionnaire interview were finished .

本文在介绍简单随机抽样比估计的基础上，对PPS抽样设计的比估计进行了系统的研究，并使用了第一次农业普查数据对方法进行了模拟。

The paper discusses the ratio estimation with systematic PPS sampling and simulates the model with the data of the First Agricultural Census in China on the base of introduction of the ratio estimation with simple random sampling .

以实证研究的方式运用servqual模型，对顾客（主要是家庭用户）的感知服务质量差距进行了调查测评，调查测评采用简单随机抽样法。

It evaluated the perceived quality of service for the customer ( primarily home user ) with SERVQUAL model and empirical research . The survey evaluate adopt simple random sampling .

研究根据YL公司实际情况，建立了员工满意度测评的指标体系，并采用简单随机抽样的方法对YL公司员工的满意度进行了全面的测评分析。

Secondly , this article established indicators of employee satisfaction survey system in accordance with the actual situation of the YL Company , and evaluated and analyzed comprehensive satisfaction of YL staff through a random sample survey .

本文以无放回简单随机抽样（SRSWOR）为例，讨论了相继调查中的轮换样本问题，证明了一个基本定理，从而为充分利用数据信息构造总体特征的估计奠定了基础。

In this paper we considered the replacement sample problemes in successive sampling under simple random sampling without replacement ( SRSWOR ) . A basic theorem was proved so that it is possible to construct various estimators of population characters in efficient use of data information .

昆虫种群简单随机抽样最适样方大小的确定

Determination of optimum plot size in the simple random sampling of insect population

分层抽样可以减少由简单随机抽样造成的抽样误差。

Stratified sampling can reduce the sampling error associated with simple random samples .

我们推导简单随机抽样下该估计值的小样本性质。

Small sample properties are derived for the estimator from simple random samples .

设计：简单随机抽样调查。

DESIGN : A simple random sampling survey .

简单随机抽样法；

Simple random sampling without replacement ;

采用种子聚类分析与简单随机抽样相结合的方法将化合物合理地划分为训练集和预测集。

The compounds were divided into learning set and predicting set by seeded clustering and random sampling .

简单随机抽样精密度

Precision of simple random sampling

三.本文得出了多目标分层抽样与简单随机抽样误差比较的结论。

Thirdly , we obtain the comparison conclusion of multi-objective stratified sampling and simple random sampling error .

简单随机抽样协方差

Covariance for simple random sampling

在简单随机抽样方法的基础上提出了分层抽样的模糊综合评价模型。

A layered sampling model for fuzzy comprehensive evaluation was developed based on simple random sampling methods .

第1阶段采用系统抽样，第2阶段采用简单随机抽样方法。

Systematic sampling and simple random sampling procedures were used for the first and second stages , respectively .

在简单随机抽样中，样本均值是总体均值的无偏估计。

In a simple random sampling , the sample mean is an unbiased estimate of the population mean .

计算结果表明，本法的抽样效果，比简单随机抽样提高1.5倍。

Computations show that the sampling effect with this method is 1.5 times higher that with simple random sampling .

使用概率抽样的比例较少，尤其简单随机抽样运用的数量则更加少。

The use of probability sampling was relatively small , particularly the use of simple random sampling is less than the quantity .

在统计推断中，从分布未知的总体中获取样本通常采用都是简单随机抽样。

When we do statistical inference work , we usually use simple random sampling to get sample from a population with unknown distribution .

首先，我们设计了一个有效的抽样方案：采取简单随机抽样从病例组抽取样本；

Firstly , we give an effective sampling design : a simple random case sample with replacement is drawn out of all cases ;

群样本检验中，系统抽样群样本检验和分层随机抽样群样本检验的效果优于简单随机抽样群样本检验。

During the course of cluster sample verification , systematic sampling and stratified sampling 's accuracy are prior to simple random sampling ' s.

接着，本研究将问卷的抽样总体确定为制造业行业企业，用简单随机抽样法选取样本。

Regard the registers of manufacturing enterprises of every area as the framework of sampling , the sample is chosen the by simple random sampling law .

证明了在期望值决策准则下，用等概率分层随机抽样得到的方案收益期望值的均值，与用简单随机抽样得到的相同。

It is verified that th action 's mean value of the expected value by simple radom sampling is equal to one by stratified radom sampling .

本研究采用简单随机抽样的方法，从符合纳入标准的4所医院随机抽取3所医院的1100名护理人员进行调查，被调查者采用匿名、独立填写的方式填写问卷。

Using simple random sampling method , with the inclusion criteria , three in four three-lever general hospitals of the 1100 hospital nursing staff conduct on-site survey .

但是，在某些实际问题中，当采用简单随机抽样比较耗时耗费时，这时可采用排序集抽样。

But in some real condition , it will take more time and effort to use simple random sampling . So we can use ranked set sampling .