1.
Methods Stratified chester random sampling.
方法采用分层整群随机抽样的调查方法。
2.
Mental state and suicidal attitude of medical students in different educational levels: A cluster random sampling investigation;
不同学历医学生的心理状况及对自杀态度:整群随机抽样调查
3.
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。
4.
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
5.
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
6.
random sampling
随机抽样,随机采样
7.
single random sampling
单次随机抽样 单次随机抽样
8.
simple random sampling
简单随机抽样 简单随机抽样
9.
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。
10.
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。
11.
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.
12.
estimation of proportions in cluster sampling
整群抽样的比例估计
13.
relative variance for cluster sampling
整群抽样的相对方差
14.
covariance for simple random sampling
简单随机抽样协方差
15.
Proportion allocation in stratified random sampling
按比例分层随机抽样
16.
precision of simple random sampling
简单随机抽样精密度
17.
500 freshmen were collected by random sampling.
整群随机抽取500名入学新生,采用症状自评量表(scl-90)进行研究。
18.
taken or to be taken at random.
随机的抽取或被随机抽