抽样

Methods: Analyses are based on a subsample (N=877) consisting of adolescents (ages 12-17) who had attempted suicide in the past 12 months, drawn from a nationally representative community survey.

研究对象来源于具有代表性的社区普查人群，对该人群进行二次抽样，共有887名研究对象入组，年龄为12-17岁之间，既往一年中均曾有过自杀行为。

For more information: read about JPEG chroma subsampling.

更多信息请查阅jpeg色度抽样。

Subsampling for dependent or nonidentically distributed data: blockwise and other methods.

非独立或分布不一致数据的次级抽样：顺时针法或其他方法。

Also,it can overcome frequency aliasing effect in general subband coding,and is more flexible than the resolution-layered coding which uses temporal subsampling and spacial filter.

另外，它比采用时间方向亚抽样和空间滤波器的分辨率分层方法更灵活，并克服了频率混叠现象。

Subsampling for dependent or nonidentically distributed data: blockwise and other methods. Carlstein.

非独立或分布不一致数据的次级抽样：顺时针法或其他方法。

This paper proposes the sampling theorem in mining subsidence according to the mathematical principle in data processing.

根据数字处理中的数学原理，提出了开采沉陷中的抽样定理。

Firstly, the paper expatiates the essence principle of the motion estimation based block matching, introduces Full Search method and several typical motion estimation fast algorithms, and analyzes each characteristic, then to sum up the key technology for increasing the motion estimation search efficiency; Secondly, it stress introduces three motion estimation fast improved algorithms: the improved algorithm based Full Search method, it imports successive elimination algorithm、subsample and termination condition to increase search speed for enhancing the real time of Full Search.

本文首先阐述了基于块匹配法的运动估计基本原理，介绍了全搜索法和几种典型的运动估计快速算法，分析了各算法的特点，在此基础上总结了提高运动估计搜索效率的几个关键技术。接着重点介绍了本文提出的三种运动估计快速改进算法。基于全搜索的改进算法，是在全搜索的基础上尝试引入了连续排除算法、子抽样和终止条件来提高搜索速度，增强全搜索的实时性。

Methods Using systematic sample method and investigating the aged of 980 in a certain community.

采用系统抽样方法，对上海市某社区60岁以上老年人980人进行问卷调查。

Methods 1 605 inpatients, who were in hospital in 2002, were collected by systematic sample.

采用系统抽样的方法按住院号抽取 8个县医院 2 0 0 2年住院病例共 16 0 5份。

Methods: The study used a systematic sample of 3,407 physicians selected from among 10,223 primary care physicians registered in the Department of Health in April 2002. A survey was mailed to collect applicable data. Five-hundred and twelve questionnaires were returned, for a response rate of 15.1%.

本研究以2002年4月在行政院卫生署医政处登记执业的10，223位基层开业医师为研究对象，采用系统抽样法，共得到3，407位，以邮寄问卷的方式搜集所需的资料，回收512份，回收率为15.1%。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。