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 research of group sampling, and give the estimate of mean with its character in the common method of group sampling, but they do not pay attention to the effect of each group in the general stage to estimate result.
在集团抽样调查中，［１］和［２］给出了一般抽样方法及均值估计和它性质的论述，但未考虑各集团在总体中的地位对估计结果的影响。
estimation of proportions in cluster sampling
整群抽样的比例估计
relative variance for cluster sampling
整群抽样的相对方差
Analysis of a Case-Control Data with Two-Stage Cluster Sampling of Controls;
二阶段整群抽样病例对照数据的分析
This paper discusses cluster sampling and stratified cluster sampling in continuous surveys with censuses.
本文讨论了连续调查中应用普查方法时的整群抽样和分层整群抽样。
The Estimation of Mean Under the Circumstances of Non-equal-probability Classified Cluster Sample Survey and Its Nature;
不等概分类整群抽样下的均值估计及其性质
Parameter Estimation Based on GEEs of the Data from Family-based Cluster Sampling;
以家庭为单位的整群抽样资料总体参数的GEE估计
Stratified Cluster Sampling and Its Application on the Improved RRT Model for Sensitive Question Survey;
敏感问题改进的随机应答技术模型分层整群抽样研究及应用
Statistical Methods of Stratified Cluster Sampling on Sensitive Questions Survey and Its Application
敏感性问题分层整群抽样调查的统计方法及其应用
Stratified Two-stage Cluster Sampling on the Simmons Model for Sensitive Question Survey
敏感问题Simmons模型分层二阶段整群抽样的统计方法
Stratified two-stage cluster sampling on unrelated question model for quantitative sensitive questions
数量特征敏感问题分层两阶段整群抽样的统计方法
Estimation of parameters in stratified cluster sampling on randomized response technique for sensitive question survey
敏感问题随机应答技术模型分层整群抽样下参数的估计
The method to estimate the sample sizes for two-stage cluster sampling and its application in survey study of theatment cost;
二阶段整群抽样的样本大小估计公式及其在医疗费用调查中的应用
Methods By using the cluster sampling method, a sample of 518 students drawn from 4 high schools in Chuzhou, then a questionnaire survey was conducted among them.
方法采取整群抽样方法对滁州市4所高中三年级毕业班学生518名进行问卷调查。
Methods To investigate Mongol and Kazakh, Uygur, Han population of aged ≥30 with methods of random sample.
方法 采取随机整群抽样法，调查30岁以上蒙古族、哈萨克族、维吾尔族及汉族居民。
Contrast group:Other 218 undergraduates were adopted in cluster sampling,taking class as unit.
对照组:除外观察组学生,随机在4届学生中以班为单位整群抽样218名学生。
A cluster systematic sampling survey of the body height distribution profile and the prevalence of short stature of urban and surburban children aged from 6 to 18 years in Shanghai
上海市城郊两区整群抽样6～18岁儿童青少年身高分布特点及矮小症患病率调查
Methods Stratified chester random sampling.
方法采用分层整群随机抽样的调查方法。
Methods The investigated sites were selected by cluster sampling from13 cities.
方法在13个市采用整群分层随机抽样的方法选择调查点。