分层抽样

The results have been adopted as the reference frame of the multi-stage, PPS (Probability Proportional to Size) sampling design of the 2005 National Health Interview Survey in Taiwan.

本文结果亦已被2005「国民健康访问调查」所采用，做为进分层多阶段、抽取与单位大小成比之等机抽样设计之考。

The research targets of the study were the grade-six students of public elementary schools in Taipei County, and the survey through questionnaires was done using stratified proportional sampling, with 1,190 valid questionnaires and valid return rate of 92% from all the questionnaires collected.

研究对象为九十五学年度台北县公立国小六年级学童，采分层比例抽样进行调查，回收之有效问卷计1190份。

Methods:Stratified quota sampling was used to select four communities,representing different community health service models.

采用分层定额抽样方法，抽取 4个不同类型的社区，以入户调查和面对面访谈的方式共调查居民 4 17名，比较贫困居民和普通居民在卫生服务需求和利用方面的差异，并了解他们对家庭病床的认识。

Methods:a cluster random stratified sample of 394 medical college students were investigated with a SCL-90 questionnaire.

采取分层整群抽样的方法抽取394名医学生进行SCL-90症状自评量表的问卷调查。

Methods Stratified random sampling method was adopted to select 4077 peasant workers from 10 enterprises to conduct questionnaire survey.

采用分层随机抽样的方法对10家企业4077名农民工的职业危害相关知识进行问卷调查。

The method of sampling took Stratified Random Sampling. There are 240 valid questionnaires in 300, sum up to 80%.

本研究采取分层随机抽样法，共发放问卷300份，得有效问卷240份，有效问卷率为80%。

Though stratified random sampling method is adopted for the arterial and collector functional systems, there is a good potential to improve it.

尽管分层随机抽样的方法已经在干线和一般的集散系统得到利用，它仍有很大的发展空间。

Because of the sampling processing, we can take the simple concave domain analysis and ICM optimization in two different levels, so as to make both the parameter estimation and optimization much easier to implement, while delivering a satisfactory result; The third one is based on the multi-resolution analysis, robust statistics and majority game theory. 4. Propose a new clustering algorithm based on the entropy concept, which is used for unsupervised segmentation of color images.

重点讨论非监督的图象分割问题，并给出了三种新方法：一是基于贝叶斯学习和全局竞争策略的方法，把参数估计和图象分割有机地结合在一起；二是基于分层的框架，从抽样定理出发，在两个不同的层次上使用简单的凹域分析和ICM优化，可以使得参数估计和优化问题都变得简单易行，并得到满意的结果；三是基于多级分析、鲁棒统计的参数估计和多数博弈论的优化算法。

Then, researcher selected adequate number of classes from every region in Taipei through convenience sampling in order to maintained apposite sampling ratio of population.

研究者参酌区域的代表性，先以「分层取样」为原则，再以「立意取样」方式於各区抽取适当的班级数，并维持适当的母群抽样比率。

Methods According to the national guidelines, clustered random sampling was made for the survey.

方法按照全国统一制定的调查方案，按病种以分层整群随机抽样的方法确定调查点。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失