查询词典 stratified sample

Therefore, the minimum variance and deviation methodology was introduced, based on which, stratified random sampling technology was used for sample design, and thus making an overall assessment more truly on water quality in distributi.

为此提出以最小方差和偏差的方法论，采用分层随机抽样技术进行样本设计，从而对管网水质进行较为真实的全面评价，同时对影响管网水质的因素进行分析。

The survey conducted in Taiwan was designed using a multiple-stage sampling method that utilized the principles of probabilities proportional to size, stratified sampling, and systematic sampling to strengthen the sample's effective representation.

为符合研究的需要，本次研究的抽样方法采取较复杂的多阶段抽样法，主要应用「抽取率与单位大小成比例」原则，结合分层抽样、等距抽样等抽样方法的优点，以求提高样本代表性。

Stratified random sampling and simple random sampling methods were used to select sample from 14 counties.

通过分层抽样和单纯随机抽样相结合的方法，抽取昆明市14个县的部分参合农民进行问卷调查。

The simple random sampling plan and stratified random sampling plan has been introduced and the application means and effects of which also has been presented,it has some characteristics such as material precision and obvious reduce of sample size,and rational advice has been presented.

介绍了简单随机抽样和分层随机抽样方法及其在检测中的应用方法和效果。

To further reduce the time pressure for a larger training data set, the algorithm creates a smaller training data set via the primary model based on a stratified sample.

为进一步减小较大规模训练数据集的回归时间压力，算法对训练数据集的分层采样建立了初步模型，进而产生实际较小规模的训练数据集。

The cross-sectional approach used a stratified sample, based on an initial list of electric power connections, resulting in the selection of 707 individuals over 18 years of age.

横截方法根据电力连接一张最初的名单使用了分层取样，造成707个个体的选择在18岁期间。

This text proceed from this promptly, discuss Stratified Sampling application and sample assessment of result of method mainly, Pass to some profit and tax amount sample investigation design of method, enterprise of shopping center, Probe into and divide layer sample actual application of technology further.

本文即从这一点出发，主要讨论分层抽样的基本方法以及抽样效果的评估，并通过对某商业区企业利税额抽样调查方法的设计，进一步探讨分层抽样技术的实际运用。

Firstly,the sampling design has great impact on the accuracy of remote sensing classification.There exists great randomicity on the result of points and cluster sample verification on the different Sampling design.On the same sampling design,the stability of point sample verification is higher than that of Cluster sample verification.Secondly,the average accuracy of different sampling designs of multi-point and multi-cluster sample verification can reflect the accuracy characteristic.During the course of point sample verification,stratified sampling's error is lower than others'.During the course of cluster sample verification,systematic sampling and stratified sampling's accuracy are prior to simple random sampling's.

研究结果表明：（1）抽样方式对遥感分类精度评价结果的影响是客观存在的，不同抽样方式下的点样本和群样本检验结果都存在一定的随机性，但同一种抽样方式下，点样本检验精度评估结果的波动幅度小于群样本检验，稳定性比群样本检验要好；（2）不同抽样方式下的多次点样本和群样本检验的平均精度检验结果基本上都能够反映分类图像的精度特征，其中，点样本检验中，分层随机抽样点样本检验效果较好；群样本检验中，系统抽样群样本检验和分层随机抽样群样本检验的效果优于简单随机抽样群样本检验。

The sample populations were choused from an educational university in middle Taiwan. Students are all enrolled in the second semester, 2005. The total populations are 4443. Stratified random sample approaching the populations and 896 samples were gathered.

本研究以中部地区某国立大学94学年度第2学期在学的大学生共4443人为研究母群体，采分层随机抽样的方法取得样本数共计896人。

Methods The constructions of food, the varieties and amounts of food absorption in 3 consecutive days were investigated. Each 50 families respectively from town, rural area, fishery region and district producing salt were chosen as random stratified sample during off-and peak seasons for seafood. The averaging daily IAC of each crowd was calculated based on the statistical forms of food composition and iodine concentration in food reported previously. The results were analyzed with SPSS software and then compared with Recommended Dietary Allowance recommended by ICCIDD.

分层随机抽样调查，于海产品供应丰、淡两季，在海岛城、农、渔、盐区各抽50户家庭，调查膳食结构及每人连续3 d摄入的食物和数量，以《食物成分表》及以往报道的食物中的含碘量为依据，计算人均每天IAC，并与国际控制碘缺乏病理事会制定的每日碘的推荐供给量比较。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。