Methods Stratified random group sampling was adopted in survey.
方法采用多级随机抽样法。
Methods 5 kindergartens were selected by whole group sampling in Fuzhou city district, 778 infant parents answered the questionnaire investigation.
方法采用整群抽样方法在福州市区抽取5所幼儿园，并对778名幼儿家庭进行问卷调查。
Adopts the group sampling law to choose 434 example physical exam rural women to carry on the questionnaire survey, carries on statistics analysis.
采取整群抽样法选择434例健康体检农村妇女进行问卷调查，进行统计学分析。
Methods: Adopting the methods of whole group sampling at random, study on 306 children aged 4-6 of 14 kindergartens in Jing an District of Shanghai.
方法：采用随机整群抽样方法，在上海市静安区抽取14所幼儿园306名4 ~ 6岁儿童进行了研究。
In this paper it not only gives the method of unequal probability in group sampling and unbiassedness of mean estimation and also gives the variance and its unbiassedness of estimation.
本文给出了集团抽样的不等概方法和均值的无偏估计，同时也给出了这种估计的方差及方差的无偏估计。
However, the study lacked a control group and used nonrandom sampling, they noted.
然而，这项研究缺乏一个控制组并且采用的是非随机抽样，他们表示。
In this project the group categorized a random sampling of blog posts and weighed words for their emotional charge.
在这个研究项目中，研究团队会对随机抽样的博客文章进行分类，并对包含情绪词汇进行衡量。
Upwards of 250 billion microscopic pieces of plastic are adrift in the Mediterranean, recent sampling by a European environmental group suggests.
某欧洲环保组织最近的抽样调查发现，地中海漂浮着超过2500亿颗的塑料微粒。
This article reviews recent works on the effects of inspection errors involving mainly acceptance sampling and group screening with brief mention of related estimation and grading.
本文介绍了最近的关于检查错误影响的工作，重点是接受抽样和群筛选，也简介了有关的估计和分等问题。
Cluster and random were carried out for sampling in each group.
组内取样采用随机法和聚类法。
Using the way, the sampling efficiency for small-probability events can be improved considerably, as can be seen from the contrasts shown in a group of results of simulation.
应用该方法可以大大提高小概率事件的抽样效率，文中给出一组仿真结果对照。
Commonly, by opening one switch and closing the other, two group equations are set up to measure rotor earth-fault resistance in the rotor earth-fault protection with switch sampling principle.
切换采样转子一点接地保护，通过两个静态开关一开一合建立两组方程来求解接地电阻与位置。
In the paper, we discuss the variable sampling in ultrasonic testing, and compare two techniques, i. e., the resampling arithmetic and the filter group.
本文对超声检测中常遇到的变采样问题进行讨论，比较了两种实现方法：基于特征值的二次采样和滤波器组，并给出了二次采样算法。
Sampling foreign foods is a highlight of many tourist itineraries but a particular group of rich Indians take a different approach to eating overseas; they bring along their own chefs.
品尝外国美食可是许多旅游行程的亮点，但有一群印度富人到国外就餐时，却采用了与众不同的方式：带上自己的厨师。
Methods Evaluations of cost-benefit for one group repeated sampling data and pairing design of repeated sampling have been explored.
方法探讨单组重复采样设计及配对重复采样设计的成本效益评价。
Forty students, selected from two natural classes by pair-sampling, were assigned to four groups, ten subjects for each group.
共有四十学生参加，他们是配对抽样从两自然班选出并被分成四组，每组十人。
Statistics group of Matematic Research Institute of the Chinese Academy of Science, "Sampling Inspection Method", Science Press, 1977.3.
中国科学院数学研究所统计组抽样检验方法。科学出版社。1977年3月。
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。
After group random sampling, home-visit was made with questionnaire to 1158 married childbearing country women in Chengjiang county.
通过整群随机抽样的方法，采用入户询问方式对澄江县115 8例农村已婚育龄妇女进行问卷调查。
The result shows that the edged sampling mirror and the edged vacuum window can be treated as a pair of prisms, which generates negative group velocity dispersion.
分析结果表明，带楔角的取样反射镜与后续光路中使用楔形真空窗口构成了一对棱镜，产生负的群速度色散。
MethodThe study was a cross sectional survey, sampling the whole group aged 80 years and above, who live in Jiajian country, Bama County.
方法截断面调查，整群抽取巴马县甲篆乡80岁以上老人。
Doctor Liu's research group chosen 50 schools in more than 300 movie-experimental schools in the whole country, and does the sampling and tracing analysis.
刘博士他们的研究小组，从2003年开始，在全国300多所电影课试验学校中，选择了50所学校，进行抽样跟踪分析。
Point sampling The behavior of just one individual in a group at a time is recorded.
定点取样：在一个团体中一次仅有一个个体的行为被记录。
The sampler adopts a group of sampling plates and a group of protecting plates to clamp osmosis membranes and fix the osmosis membranes together by screws;
采样器采用一组采样板和保 护板夹住渗透膜通过螺丝固定在一起；
The rats in each group were sacrificed for lung tissue sampling on day 14 and day 28 after intratracheal instillation respectively.
各组分别在气管滴注后第14天和第28天处死大鼠，取肺组织样本。
The rats in each group were sacrificed for lung tissue sampling on day 14 and day 28 after intratracheal instillation respectively.
各组分别在气管滴注后第14天和第28天处死大鼠，取肺组织样本。
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