查询词典 stratified sampling

Unequal probability sampling is a very effective method for sampling applications,which is a sampling scheme with unequal probability .

不等概率抽样是赋予总体每个单元不完全相等入样概率的抽样，是实际中十分有效的抽样方法之一。

We can get around this problem unknown sampling error to a large extent if we use probability sampling, since we can get estimates of the sampling error from the sample itself.

偶们可以处理这个难题未知的抽样误差在非常大程度上假如我们用概率抽样，因为我们可以从样品本身的抽样误差估计。

That is sampling 15 percent of total amount, grouping according the code, simple proportional sampling and clustering sampling with group. A core collection bank of ...

按照最佳建库方案构建起了一个以资源总数3170份的15%，即477份核心样品资源可代表总体资源98%以上的遗传多样性的核心种质库。

As the results of this sampiing area were far below those derived from calculation of the critical sampling area, the paper concluded that the setting size and direction of a basic sampling quadrat could have a great influence on the efficiency of each sampling.

研究发现沿垂直于沙丘走向的方向布样，以4m 4m为基本样方，抽样272m^2即达到60％群落物种，远低于临界抽样面积的求解结果，表明基本样方大小和设置方向对抽样效率产生重要影响。

A fire\|new theory for periodic or quasi\|periodic signal sampling is proposed,w hich is especially for sampling high\|frequency wideband periodic or quasi\|peri odic signal by low sampling rate system.

涉及一种周期或准周期信号的采样技术，特别适用于低频采样系统采集高频宽带周期或准周期信号。

The experiment show that the sampling strategy using Halton points is better than the random sampling strategy at sampling points distribution.

实验结果表明，Halton点采样策略比一般的随机采样策略具有更好的采样点分布。

Bull; Add sampling cup at any time during sampling as per various liquor ratio and cloth, whitch does not affect sampling speed .

在打样时可不同浴比、不同布种随时加样杯，不影响打样速度，升温途中可加样杯。

Our company has designed and produced successfully series of Fast Response Sampler which are the newest units for sampling by absorbing the advanced technology from abroad They boast a series of strong points,such as fast response to the sampling,simple operation,high accuracy and so on,It is an ideal unit for sampling.

科学技术的进步，推动着检测技术的发展，我公司在学习国外先进技术的基础上研制成功，并已投入生产快速取样器系列产品，是最新颖的取样装置，它具有取样快速、制样简单、质量优良等一系列优点，是一种理想的取样工具。

First, the importance of synchronized sampling based on GPS for power system is introduced. Second. the generalscheme of GPS-synchronized sampling unit developed by the authors is presented. Then, the design scheme of each part ofthe GPS-synchronized sampling unit is presented in detail.

介绍了基于 GPS同步采样在继电保护和自动装置等方面的作用，提出了实现 GPS同步采样的方案，详细给出了基于 GPS同步采样单元的设计方案，并给出了其在故障定位和输电线路参数测量中的应用举例。

Cluster sampling: When the basic sampling unit in the population is to be found in groups or cluster s the sampling is sometimes carried out by selecting a sample of cluster s 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。

Anna: No, I've got a hangover.

不是，我昨晚宿醉了。

We head into the mountains in Su's new Land Cruiser, stop for lunch at a scenic restaurant and then hang around drinking beer and eating fruit as two of his employees attempt to lure the birds with a tape recording of the fowl's mating call.

我们坐上苏的巡逻车向山顶出发，在一家风景优美的餐馆吃了中饭。然后我们喝着啤酒吃着水果四处逛。