查询词典 stratified sample

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。

Methods a cluster stratified sampling method was used to chose 3 989 pupils from six schools of different levels in xiamen. they were investigated with conners parent symptom questionnaire.

采用整群分层抽样法抽取厦门市6所不同层次的小学一～五年级学生3 989名为调查对象，应用conners量表进行调查，dsm-ⅳ诊断标准确诊。

Stratified analysis and Logistic regression analysis were performed taken gender, waistline and body mass index as covariants. Results showed that the frequency of the allele and the genotype in variant site was still no associated with the development of T2DM.

以性别、腰围和体质量指数为协变量进行了分层分析和Logisitic回归调整，但结果仍未发现该变异位点各基因型和等位基因与2型糖尿病的发生存在显著性关联。

Methods To adopt multiple phase,stratified random sampling and questionnaire survey,857 donators involved.

采用分层随机抽样的方法，对前来献血的857名献血者进行调查，并对知情人进行访谈。

The microstructure of circumfluence and the characteristic of the mixing intensity on the cross-section of thermally stratified shear flow in curved flumes are studied experimentally.

对弯段温差剪切分层流的断面环流微细结构与掺混强度特征进行了试验研究。

METHOD:Stratified randomized sampling method was conducted questionnaire investigation among 668 infant fosterers in Wuyuan and Shanggao County.

采取多阶段分层整群随机抽样，对江西省婺源县、上高县668名婴儿抚养者育儿知识进行问卷调查。

Downdraft stratified gasifier is suitable for small scale heat and power production due to the fact that its producer gas contains low tar and low particulates.

以下抽式气化炉可制造出低焦油量与低粒子之乾净产气，非常适合小型之热电共生系统来使用。

A heating scheme of gas-fired radiation combined with stratified forced-draft in large space building s is put forward.

提出了高大空间建筑实施燃气辐射与分层送风相结合的供暖方案，结合实例进行了计算流体力学模拟。

Migrant workers should be combined with the characteristics of the group, due to lower payment rate and strengthen the social security system in urban and rural areas of convergence, the classification of the establishment of migrant workers the minimum livelihood guarantee system for migrant workers groups and the characteristics of the stratified social security system.

完善农民工社会保障制度，解决&民工荒&问题是落实科学发展观的迫切要求，也是实现社会和谐的必然要求。应结合农民工的群体特点，适当降低缴费率，加强城乡社保体制的衔接，分类建立农民工最低生活保障制度和适合农民工群体特点的分层社会保险体制。

Migrant workers should be combined with the characteristics of the group, due to lower payment rate and strengthen the social security system in urban and rural areas of convergence, the classification of the establishment of migrant workers the minimum livelihood guarantee system for migrant workers groups and the characteristics of the stratified social security system.

所以，到校伊始，同学们首先就必须端正自己的学习态度，树立远大的理想和抱负。有近15%的同学在860元～1350元之间，这就比较自由了。。有了良好的开端就会有美好的希望。4。消费差距拉大，出现两极分化我们曾经搞过一次关于大学生在消费调查，其结果有近16%的同学在350元以下在比较困难的生活线上坚持学业；。高职新生在肯定自己、相信自己的同时，也必须意识到自己的弱点和不足。

I can not negligent, he should do what?

我不能不在意了，他要做什么呢？

It is very dangerous to swim in the river alone.

一个人到河里游泳是很危险的。