随机取样

对随机取样的过程、特征及缺陷进行了分析，提出一种基于KD树子样的聚类初始化方法。

This paper focuses on the process and property of random sampling , and proposes a novel random sampling method which is based on KD-Tree samples .

研究表明，该方法在构建核心子集过程中所用的聚类次数远远超过作为对照的逐步聚类随机取样（SCR）法。

The results showed that constructing core subsets in the same sampling percentage , the cluster times of LDSS method were far more than those of the method of stepwise cluster based on random sampling ( SCR ) .

1999年3月～2002年3月，通过对集贸市场等有关生产经营单位进行随机取样计2766份，作酶联免疫吸附法（ELISA）、气相色谱-质谱联用法（GC/MS）检测。

2766 samples were collected randomly at farm product trade markets and monitered by Enzyme Linked Immunosorbent Assay ( ELISA ) and GC / MS.

每个群体随机取样30个，5对AFLP引物获得326个位点。

Five pair AFLP selective primers scanned 30 samples from each population and 326 AFLP loci were recorded .

在海南某县一农贸市场对市售松花蛋（皮蛋）随机取样，在实验选定适合的测定条件下，通过原子吸收光谱法分析市售松花蛋重金属铅（pb）的含量。

By sampling preserved eggs at random at a farm produce market in a certain county of Hainan , under suitable experimental determination condition , the amount of heavy metal lead in preserved eggs on sale has been analyzed by means of atomic absorption spectrum .

并制定合理的居群取样策略，对上海江湾机场的一个天然野大豆居群进行了100个单株（个体）的随机取样，并用ISSR分子标记对其进行了遗传多样性分析。

In China , a natural population from Jiangwan Airport in Shanghai was studied for its genetic diversity through the inter-simple sequence repeat ( ISSR ) marker analysis of a sample set consisting of 100 randomly collected individuals .

另外经过对组内随机取样法、最大离差度法和最大遗传距离法3种不同抽样方法的比较，认为最大遗传距离法较为适合用RAPD数据构建黄瓜核心样本。

Secondly , three sampling strategies ( random sampling method , maximal deviation method , and maximal genetic distance method ) were compared . The result demonstrated that the strategy of maximal genetic distance was better than others in establishing cucumber core collection with RAPD data .

数值结果表明：这两种方法均能给出带有尖锐间断阵面的两相激波松弛结构.二阶GRP方法在计算精度和机时耗用等方面优于随机取样法。

The numerical results indicate that both the two methods can give the relaxation structure of the two-phase shocks with a sharp discontinuous front and that the GRP method has the advantages of less time-consuming and higher accuracy over the RCM method .

本分析采用随机取样法，对贵州威宁引入的新西兰考利代羊羊毛品质进行了全面测定。

Random sampling method was adopted in this experiment .

智能型随机取样系统设计

The Design of an Intelligent Randomization Sampling System

采用五点取样法，在田间随机取样，每个样点0.2平方米，调查了玉米田间的杂草种类及其发生规律。

The kinds and the occurrence peak of weeds were investigated by five-spot-sampling method .

螺杆制冷机压缩过程随机取样的统计分析

A Statistic Analysis of Random Data Sampling in the Compressing Stage in a Screw Type Refrigerator

群体研究是在一段时间内对特定群体进行的纵向研究（随机取样）。

A cohort study is a longitudinal study in which a specific population is studied over time .

采用典型样株和随机取样的方法；

Typical sample-tree selection and random selection were applied in this study . Methods : Part ⅰ .

最后采取拼接与随机取样检验相结合的方式对校正结果做出了评价。

Lsat take the stitching and random sampling and testing of a combination made the evaluation of calibration results .

采用随机取样的方法产生本次故障次数以及故障设备编号。

Both the fault times and facility ID numbers for this simulation can be obtained using the random sampling method .

方法在香港一中风康复科进行前向单盲随机取样对照试验。

Method A prospective single blinded randomized controlled trial was carried out in a stroke rehabilitation unit in Hong Kong .

这个命令显示的数据压缩率是根据对表行的随机取样计算出的估计值。

The ratios this command displays are data compression estimates based on a random sampling of rows from the table .

在各物候期内，采用随机取样法测定羊草种群的繁殖对策。

In the every phenological period , through random sampling , the reproductive strategy of community of leymus chinensis was investigated .

二元颗粒混合物的随机取样方式有两种：一是按颗粒数目取样，二是按质量取样。

Investigation on the sampling error of two-component Particulate mixture is very essential to the general theory of sampling for chemical analysis .

以分层随机取样的方式选取了山东省12个地区的29所高中。

Have chosen 29 high schools of 12 areas in Shandong by way of dividing floor and taking a sample at random .

方法采用分层随机取样法对抽取的15名陆军军人进行结构式访谈。

A STRUCTURAL APPROACH TO TEMPORAL SEMANTICS Methods The 15 soldiers selected through a hierarchical sampling method were treated by an un-structured interview .

提出了一种基于随机取样技术的高速数字存储示波器的实现技术。

A realization technique of high speed Digital Storage Oscilloscope ( DSO ) based on random sampling technique is presented in the paper .

采用多样地随机取样方法，对不同群落中羊草、芦苇和全叶马兰的构件形态特征进行了观测与分析。

The module morphological characteristics of Leymus chinensis , Phragmites communis and Kalimeris integrifolia were measured and analyzed by sampling randomly in thirty sites .

本课题研究对象是高速数字存储示波器的高速随机取样变换技术。主要从频域和时域两个方面加以分析论述。

High-speed random sampling of high-speed Digitizing Storage Oscilloscope is discussed in this thesis and which are mainly analysed in the time-domain and the frequency-domain .

根据统计学原理进行抽样估计，在两个平原地区面积大约20hm2的粮田上，用随机取样方法选择8个农户地块取样，从统计上来说基本能满足其土壤肥力评价要求。

It is believed that randomized selection of 8 samples for each domain of the plain areas is statistically enough to estimate the soil fertility .

采用分层随机取样的方法，对202名幼儿教师进行了问卷调查。其中普通幼儿园发放问卷73份，天津市一级幼儿园发放问卷129份。

There were 202 kindergarten teachers who filled the questionnaire , 73 of them were from ordinary kindergartens while 129 were from the first class kindergartens .

在随机取样的基础上，进行化学成份分类不仅基本反映了软弱夹层的矿物成份，而且反映了其宏观构造和微观结构特征；

Based on the probability specimen , the classification of chemical compositions in weak interlayers not only basically reflects their mineral constitution , but also structures .

研究过程中，每年从阿富汗的29个省份中分层随机取样选择提供基础系列医疗服务的500到600个医疗机构。

In each year of the study , 500 – 600 health facilities providing the BPHS were selected by stratified random sampling in29 provinces of Afghanistan .

虽然许多调查所用的随机取样不能覆盖大部分人口，但是这一过程使人们能更深刻地理解选举和消费的模式。

Although random sampling used for many surveys fails to cover large segments of the population , the procedure nonetheless offers insight into voting and consumption patterns .