Simple cluster sampling

Methods Cluster sampling method was used and the results were analyzed for cultivable bacteria in several representative hospitals of Chengde city from May 1998 to May 2000.

方法采取整群抽样方法,对承德市几家有代表性医院从1998年5月至2002年5月的临床细菌培养结果进行统计分析。

Methods 3299 students in Tongcheng middle and elementary schools were sampled by cluster sampling and some common diseases were investigated.

方法　通过整群抽样对桐城市 32 99名中小学生进行健康检查和常见病的监测。

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。

In the researches of family-based cluster sampling, the observations of interested variable of the same family members are correlated.

在以家庭为单位的整群抽样调查研究中,由于家庭成员的观测指标间存在一定的内部相关性(intra-family correlation),不符合独立性的假设,若用传统的基于独立性假设的有关方法直接进行分析,即忽略了观察对象在不同家庭的内部相关性,误将其看作独立样本,得到的各参数估计值的有效性和其他统计特性均会受到影响,甚至会给统计推断结论带来偏倚。

The simple random sampling plan and stratified random sampling plan has been introduced and the application means and effects of which also has been presented,it has some characteristics such as material precision and obvious reduce of sample size,and rational advice has been presented.

介绍了简单随机抽样和分层随机抽样方法及其在检测中的应用方法和效果。

This paper detailed introduced the two sampling methods, simple random sampling, and stratified sampling, and analyzed the features of the two methods.

我国现行既有房屋构件质量评定检测抽样技术存在明显的缺点,本文详细介绍了以数理统计为基础的简单随机抽样和分层随机抽样两种方法,分析了两种方法的特点。

This paper introduced several methods about the concrete strength inspection: the sampling method given by the present specification; simple random sampling without replacement; stratified sampling .

具体介绍了砼强度检测抽样的几种方法:现行规程抽样法;简单随机抽样法;分层抽样法。

Simulating Analysis of Data of Ratio Estimation Effect in Sampling:the Comparison between Simple Sample Design and PPS Systematic Sampling Design;

调查内比估计效果的数据模拟分析——关于简单抽样设计与PPS系统抽样设计的比较

simple random sampling

简单随机抽样 简单随机抽样

covariance for simple random sampling

简单随机抽样协方差

precision of simple random sampling

简单随机抽样精密度

Development of Systematic Sampling Dynamic Linkable Library with VB

VB实现简单随机抽样的DLL开发及应用

single random sampling

单次随机抽样 单次随机抽样

Three sets of EST schemes were advanced, i.e. Whole-Tree Sampling (WTS) , Ring-Branches Sampling (RBS) and Simple Estimation Sampling (SES) .

对估值抽样提供了三种方案:整株抽样,轮枝抽样,简易估计法。

Selective Translation:A Translation Method for Simple (Short) English Sentences;

抽译:英语简单(短)句的一种译法

A shelter of simple construction.

建筑式样简单的遮蔽物

Briefly the facts are these.

简单地说，事实就是这样。

A type of probability sample in which aggregations of sampling units, called clusters, are sampled at some stage in the process.

是一种将样本单元聚集在一起的随机抽样法.样本群在抽样的某一步骤被抽出.

The Sampling Programme about Talent in Non-public Ownership System;

非公有制经济单位人才调查抽样设计

This class simplifys the extraction of information from comma seperated value( CSV) files.

这个类简单化了从逗号分离值(SV)件中抽取信息。

The Action-Sentence Compatibility Effect of Simple Sentence Including Abstract Verb;

含抽象动词的简单句的动作—句子相符效应

The information concerning the changes of the sampling methods shall be recorded in the Imported Drugs Sampling Record Keeping Form.

变更抽样方法的情况，应当在《进口药品抽样记录单》中予以记录。

In the case of collecting samples as evidence, the party concerned shall be notified to come to the scene, and a list of the samples collected as evidence shall be made.

对需要抽样取证的，应当通知当事人到场，并制作抽样取证清单。

Multistage sampling in forest inventory is not restricted to fixed-area sampling units.

森林资源清查中，多阶抽样并不局限于固定面积的抽样单元。

Random sampling is the basic sampling method in medical research and design. The paper presents the develop-ment and applications of sampling program.

单纯随机抽样是医学科研设计中最基本的抽样方法,介绍抽样程序开发过程及应用。