查询词典 stratified sampling

Cluster sampling: When the Basic sampling unit in the population is to be found in groups or clusters the sampling is sometimes carried out by selecting a sample of clusters and observing all the members of each selected cluster.

整群抽样：一种抽样方法。当母体中的基本抽样单位是按群、组分类时，有时抽样方式是选择一类样本群组，然后对被选择的群组中的每一个样本单位的全体成员进行观察。

The 3D wavelet sampling theorem has been obtained from 1D wavelet sampling theorem using scalar product method and then it is used to improve ART in direct volume reconstruction. In the other hand, the 1D wavelet sampling theorem is applied for the analytic direct reconstruction algorithm too.

7将一维小波取样定理推广到高维情形，并以此给出了一种改进的直接体积重建的ART方法，并进行了计算机模拟；将一维小波取样定理应用到了解析类的直接体积重建算法之中。

A sampling oscilloscope is a special type of DSO that exclusively uses a technique called "sequential equivalent-time sampling" or just "sequential sampling".

采样示波器是一类特殊的数字存储示波器，使用了独特的技术"连续等效时间采样"或"连续采样"。

Two-stage sampling has only one chance of using the information provided by samples to determine the following plan. Pure sequential sampling, however, could use sampling size sparingly. In addition, in some cases, pure sequential procedures have to be applied to acquire the confidence intervals which meet the demands.

两步抽样，只有一次机会利用样本信息决定今后计划，采用纯序贯则可使平均抽样次数节省，另外，在一定的分布族中必须采用纯序贯才能取得满足要求的区间估计。

Then we suggested the technology of sequential sampling and theoretical sampling and distribution points of random sampling of the loose smut of wheat by using the Iwao and Kuno and Green and Iwao-Kuno methods which may be useful for reference to forecast and control this disease.

用Iwao、Kuno、Green和Iwao-Kuno方法研究，提出了序贯抽样技术、理论抽样数和随机抽样分布点，以供在测报和防治工作中参考。

Systematic grid sampling is the most popular method at present, but it could loss some important distribution information. Systematic unaligned sampling is the most ideal method. It is easy to find periodical distributing field information with systematic unaligned sampling method.

其中规则栅格采样是目前最常采用的方法，但容易丢失一些比较重要的分布信息；系统分层采样是最理想的方法，容易发现具有周期性分布的农田信息。

Methods 962 households in three regions of Baoding city were selected for the household survey through two stage sampling method - random cluster sampling and systematic sampling.

通过两阶段抽样方法调查保定市南市区、北市区和新市区 96 2户居民的健康状况和卫生服务利用情况。

Methods 962 households in Baoding City were selected for the household survey through two stage sampling method_random cluster sampling and systematic sampling.

通过两阶段抽样方法(随机整群抽样和系统抽样)调查了河北省保定市南市区、北市区和新市区 3个区的 962户居民的卫生服务利用情况，采用调查表的方式入户调查，并将被调查家庭分成 3组：相对贫困组、贫困临界组和一般家庭组进行公平性分析。

In section 2, if φ satisfies some conditions, a result is obtained that f can be reconstructed from the sampling values when the sampling set is Z or the sampling set is a small perturbation of Z.

在第二节，我们证明了若φ满足适当的条件，采样节点为整数节点或采样节点为为整数节点的微小扰动时，函数能够由其采样值稳定而且唯一的重建。

First, this paper gives an introduction of some methods of unequal probability sampling, their estimators and variance estimators, including sampling with pps with replacement, methods of sampling without replacement suggested by Brewer, Durbin, Sampford , Des Raj , Murthy , Rao-Hartley-Cochran. Then, at the basis of Rao and Bayless's study , we consider that population can be splited two random subpopulations, which are respectively drawn from different infinite super-populations, and compare the stabilities of estimators of the methods that given above.

本文首先从理论上介绍了若干种不等概率抽样方法，它们的估计量、估计量的方差及其估计，其中包括有放回PPZ及PPS抽样，不放回不等概率抽样中的Brewer、Durbin、Sampford、Des Raj，Murthy、Rao-Hartley-Cochran等人的方法；其次，在Rao和Bayless两人就样本单元数n=2的情形对上述抽样方法进行比较的基础上，将总体随机地分成两个子总体，视每个子总体取自不同的线性超总体，在文中，我们利用计算机实现随机分组，并通过画图比较各方法估计量的稳定性，结果表明，对变异系数C.V。

Mr. Putin said there were signs of genocide against the Ossetian people.

普京说，有迹象表明对南奥塞梯人进行了种族清洗。

What I'm trying to say, Tristan is...

特瑞斯坦。我想说的是。