METHODS an investigation was made by cluster and stratified sampling method.
方法采用多阶段分层整群抽样方法入户调查。
Stratified sampling method was applied to investigate immunization status of ecdemic children and its affecting factors in Baoshan District.
方法采用分层抽样方法对本区外来流动儿童免疫接种现状及其影响因素进行流行病学调查。
Stratified sampling method, from a polytechnic school in Qingdao test samples were 850, 809 valid questionnaires were valid for the 95.18 percent response rate.
采取分层抽样法，从青岛某理工院校抽取被试850名，收归有效问卷809份，有效问卷归收率为95.18%。
Methods A cluster stratified sampling method was used to choose 3 251 students from 60 classes in 10 middle schools, among which, 3 044 questionnaires were available.
方法按照分层随机整群抽样的方法，抽取蚌埠市10所中学60个班级的3 251名高中生为研究对象，获有效问卷3 044份。
PARTICIPANTS: Totally 528 students, aged 17 to 20 years old, were recruited from grade one of year 2003 in Southwest University of Science and Technology with stratified sampling method.
对象：调查对象来源于以整群分层方法抽取的2003级在西南科技大学就读的一年级学生528名，年龄17～20岁。
Methods: Using stratified sampling method to determine the survey places, The schistosomiasis in people and livestock were surveyed by the methods of nylon bag incubation and top - tube incubation.
方法：用分层随机抽样法确定调查点。 用尼龙袋集卵孵化法、顶管孵化法分别对人畜进行查病，用系统抽样结合环境抽样法开展螺情调查。
Method Some food processing employees were selected according to stratified random sampling method, and filled in a unified questionnaire anonymously.
方法按照分层随机抽样原则随机抽取部分食品从业人员，匿名独自填写统一的调查问卷。
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。
Methods: Stratified random cluster sampling method was used to determine the survey sample.
方法：以分层随机整群抽样的方法，确定调查样本。
Methods The questionnaire survey was conducted among 1 700 college students with stratified-cluster sampling method.
方法采用分层整群抽样方法对暨南大学在校学生1 700名进行问卷调查。
Methods With stratified cluster sampling method, 2 519 students were questionnaired in Anhui province.
方法采用分层整群抽样方法，对安徽省2 519名中小学生进行问卷调查。
Methods:Adopt the method of stratified cluster sampling, women were investigated through questionnaire in family.
方法：采用分层整群抽样的方法，对育龄妇女进行入户调查。
Also the results showed that the Stratified Random ClusterSampling is an adequate sampling method for the genetic variation analysis of yellow cattle population.
同时研究表明，系统随机整群抽样是进行黄牛群体遗传变异分析的最适抽样方法。
Method Using stratified random sampling method.
方法采用分层随机抽样方法。
The influencing factors of feat technique in hygiene were investigated in Sichuan with the method of the stratified sampling and the categorical data analysis.
采用分层抽样方法和分类资料统计方法，开展四川省农村卫生适宜技术推广影响因素调查研究。
RESEARCH METHODThe stratified multi-stage cluster random sampling method was used in the survey.
研究方法本研究采用分层整群随机抽样方法进行抽样。
Methods. The survey was conducted according to multi-stage stratified cluster sampling method.
方法：分阶段分层整群随机抽样调查。
Method: Using stratified cluster sampling, sampling an elementary school respectively in the city and countryside, carries on the check by sight and the correlation factor investigation.
方法：应用分层整群抽样方法，在城市、农村小学中各抽取一所小学，进行视力检查及相关因素调查。
Method: Using stratified cluster sampling, we choose 1600 soldiers and investigate by questionnaires and secret talking.
采用分层整群抽样方法，选取1600名战士，以无记名调查问卷和向调查人员访谈的方式进行调查。
Methods Serum uric acid (SUA) was measured among 7778 inhabitants aged over 20 years old in 2 communities in Nanjing with the method of stratified cluster sampling.
方法采用分层整群抽样的方法，对南京市两个社区7778名20岁以上的居民进行了血尿酸普查。
Multiple stratified cluster sampling method was used in the Health Service Investigation on residents in Weihai.
利用分层整群抽样的方法对威海市居民进行健康调查。
Then, a weighted vehicle-hours-traveled (VHT) based traffic congestion indices (TCI) model was developed by using stratified sampling and comprehensive evaluation method.
在此基础上，采用分层抽样技术和综合评价法，构建了基于车辆行驶时间（VHT）加权的分层次交通拥堵指数（TCI）模型。
Methods: Stratified cluster sampling method was used to choose students to complete "SCL 90 Mental Symptoms Table".
方法：以简明精神症状自评量表(SCL 90)为测试工具，采用分层整群随机抽样研究方法。
Methods The survey of prevalence of dental caries in group aged 12 and 15 years in Anhui province was conducted using the non-proportional, stratified, cluster sampling method.
方法对安徽省四县市的12岁及15岁儿童的龋病发病情况进行抽样调查，采用分层、不等比、多阶段整群抽样的方法。
METHODS Questionnaire survey is stratified and random sampling method in the form.
方法采用分层随机抽样的方法以问卷的形式进行调查。
Methods 3 460 children aged 3 to 6 were enrolled into this study by using a stratified cluster sampling method in Wuhan. Parents of the children were surveyed with a questionnaire.
方法采用分层整群抽样方法抽取武汉市3 460名3~6岁儿童作为研究对象，应用自行设计的儿童睡眠状况问卷对儿童家长进行调查。
Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
方法对社区人群采用多阶段分层整群随机抽样方法抽取研究对象，进行个案调查和血清学检测。
Methods: By using questionnaires with multistage stratified random cluster sampling method, 726 valid questionnaires of 800 were backed from the university students in 4 universities in Dalian city.
对象与方法：研究对象采取分层整群随机抽样的方法，在大连市4所高校大一、大四年级学生中发放问卷800份，收回有效问卷726份。
Methods: By using questionnaires with multistage stratified random cluster sampling method, 726 valid questionnaires of 800 were backed from the university students in 4 universities in Dalian city.
对象与方法：研究对象采取分层整群随机抽样的方法，在大连市4所高校大一、大四年级学生中发放问卷800份，收回有效问卷726份。
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