sampling size

Determining the Optimal Sampling Size in Case - control Study

病例对照研究设计中优化样本含量的估计

Furthermore , our algorithm can support small sampling size .

此外，PARAFAC算法可以支持小样本。

Determination of Sampling Size of Weibull Population by Statistical Experiments Method

用统计试验法确定韦伯总体取样的样本大小

Effects of sampling size on measurements of soil saturated hydraulic conductivity

取样尺寸对土壤饱和导水率测定结果的影响

Total sampling size is 3 800 of 0 - 18 years children and young adolescents .

两县计男女童各1900名，总样本量3800名0-18岁儿童青少年。

The variance of sampling size is more stable than those of other probability sampling schemes .

与其他概率抽样方法相比，自适应抽样最终抽取的样本数更稳定、更可靠，并给出了最终样本数的概率分布。

The scientific sampling size and suitable sampling number under different densities on the two pests were consequently determined .

据此，确定了两种害虫的科学抽样方式和不同密度下的合理抽样数量。

The compressive sensing theory can compress the sampling size and reduce the computation cost of subsequent processing greatly . 3 .

通过压缩传感理论，能够以极大的比例对采样数据进行维数压缩，降低后续处理的计算成本。

On Spatial Distribution Pattern , Variable Transform and Theoretical Sampling Size of the Parasitic Fleas on Citellus undulatus

长尾黄鼠体外寄生蚤空间分布格局、变量转换及理论抽样量研究

This study attempts to deal with the problems encountered in the process of the pilot work by computer simulation . Such problems are about estimation methods , and appropriate allocation of sampling size .

本研究通过计算机模拟方法来解决试点工作过程中遇到的与估算方法选择、适当抽样数量分配的相关问题。

The rank distributions of sampling size between china journals and medical university journals N between national journals and province medical journals are same , and different between each other journals .

中华系列与医大学报、中国系列与省级期刊的样本容量等级分布相同，其他任意两种期刊样本容量等级分布不同。

In explicit UPDATE STATISTICS operations in MEDIUM mode , a new SAMPLING SIZE option in the Resolution clause can specify the minimum number of rows to sample for column distributions .

在MEDIUM模式的显式的UPDATESTATISTICS操作中，Resolution子句中新的SAMPLINGSIZE选项可以指定列分布进行抽样的最少行数。

This paper circumstantiates three issues to be solved for designing an effective and efficient web site mining algorithm , i.e. , the sampling size , the analysis granularity , and the representation structure of web sites .

从站点的采样尺寸、分析粒度和描述结构3个方面分析了设计高效的Web站点挖掘算法所需要解决的问题。

Taking into account the integrated effects on the probabilistic assessment of the scattering regularity and the sampling size , probability-based constitution models with arbitrary survival probability and arbitrary confidence are constructed , respectively , by the Ram-berg-Osgood equation and its modified form .

同时考虑数据分散性规律和数据量对概率评价的影响，基于Ramberg&Osgood方程及其修正形式，提出了任意存活概率和置信度的随机循环本构模型及其参数的求解方法。

In China , RAPD has been widely used in entomological studies and has given many useful results , more improvements should be performed toward sampling size , the optimization of reaction conditions , data analysis and the selection of profound study objects when using RAPD in entomology .

在我国，RAPD被大量地应用于昆虫学的研究中，并取得了丰硕成果，但在样本量、扩增条件优化、数据分析、研究问题的深度及应用范围等方面还有待进一步发展。

The simulation distribution maps of BPH , which was interpolated by Ordinary Kriging , showed that the density of BPH populations in west Guangdong province were higher than that in the east . The effect of sampling size on the spatial structure of BPH was not significant .

空间分布模拟地图能反映褐飞虱种群在田间的具体分布情况，广东西部地区每一世代褐飞虱的发生密度均高于东部地区。

Variable Sampling Point Size Design Centering Problem

变样本容量中心值设计

It has recommended suitable sampling grain size possible to get rid of eolian sand .

推荐消除风成沙影响的合理采样粒级；

The results show that a variation in circular sampling aperture size may cause much less fluctuation of the granularity values measured , i.e. which may be more steady , than that in square sampling aperture size .

测量的结果表明，与方孔采样的结果不同，圆形采样孔孔径尺寸的微小变化所引起的颗粒度测量值的波动小，测量值比较稳定。

Its main work includes the Yellow River sediment cross-section tests , river bed surface quality sampling and particle size distribution analysis and so on .

其主要工作内容包括黄河河道断面淤积测验，河道表层河床质取样及颗粒级配分析等工作。

Sampling techniques and sample size requirements vary with the techniques used .

取样方法和取样多少的要求因所采用的测试方法而异。

Application of systematic sampling photography in Boulder size distribution

爆破块度的系统抽样摄影法应用研究

Influence of sampling frequency and sample size on turbulence statistics in open-channel flow measurements

采样频率及样本容量对明渠紊流统计值的影响

For the classical control charts their parameters , such as sampling interval , sample size and control limit coefficients , are all fixed .

由于经典的质量控制图均假设抽样区间与样本容量是固定的，且控制限也是固定的（常用的即为3σ准则），这一点很不适合当今经济社会的发展。

It depends upon the sampling methods and the size of the disease rate whether exposure odds ratio ( EOR ) in case-control studies can be used to estimate the CIR or IDR .

在病例对照研究中，是否可用暴露比值比（EOR）作为CIR或IDR的无偏估计，取决于抽样方法和疾病率高低。

By the undisturbed soil sampling and soil particle size fractionating with ultrasonic separation , distribution of heavy metals in soil particle size fractions in major paddy soil type in the Tai Lake region , China was studied .

采用原状土样分离技术，研究了太湖地区几种主要水稻土不同颗粒中重金属元素Pb、Cr、Cd的分布。

Subsequently , the stabilizing conditions to keep the correlation in its order are analyzed in the aspects of the model , the sampling manner , the size of the swatch and the count of the swatches .

随后，从模型角度分析关联度保序的稳定条件，由采样方法的角度分析采样方式、样本大小、样本数对关联性分析的影响。

Further Matlab simulation is carried out to prove its feasibility and meanwhile how to select when coding the parameters of PN code such as sampling frequency , bit size , PN sequence length and PN amplitude etc. is put forward .

通过Matlab仿真进一步验证可行性，对编制伪随机码时将要选择的一些重要参数，如采样频率、码元宽度、伪随机序列长度、伪码幅值等进行了仿真实验，定性给出了选择标准。

Methods : Data was from a questionnaire survey among 18-40 years old migrant males in urban Beijing in 2004 by a stratified quota sampling with a sample size of 885 . Results : Proportion of ever used condoms was high among the migrants .

方法：数据来自2004年在北京城区18~40岁流动男青年中开展的结构式问卷调查，885人的调查样本通过分层配额抽样得到。

The result indicates that the accuracy performance of improved stratified sampling technique is well-above other sampling methods in packet size distribution aspect , and improves measured precision greatly .

结果表明，改进的分层抽样技术在测量报文长度分布方面的准确性性能远高于其它抽样方式，提高了测量的精度。