多元分布

While 30-year mean temperature data from 624 meteorological stations in China was spatialized, the temperature was divided into regular component, which is affected by longitude, latitude and altitude, and irregular component affected by other local factors. They were spatialized with multiple variable regression and inverse distance weighted interpolation respectively. There was a correlation ratio of R=0.98 between temperature and geographical factors including longitude, latitude and altitude.

在对中国624个气象站多年平均气温数据空间化过程中，通过30秒分辨率的数字高程数据，把气温分解为受经纬度、海拔高度影响的规律性成分和受其它因素影响的非规律性成分两部分，并分别用多元回归和反距离权重内插方法对二者实施空间化，最后将空间化结果进行合成得到基於栅格的中国多年平均气温分布数据。

In this paper, we studied the robust estimation and the multivariate Laplace distribution which is closely related with the robust estimation.

本文主要研究了稳健估计及与之密切相关的多元拉普拉斯分布。

According to the characters of turbidite sand body of Niuzhuang subsag, such as thin reservoirs, deep embedding, unstable distribution, high concealment and etc, and based on expatiating on the principle, method and key technique of the log constrained inversion, this paper summarized the inversion experiments fitting for the reservoir exploration, including multifactor calibration of synthetic seismogram, the found of original impedance and the choice of inversion method.

针对牛庄洼陷浊积砂体具有储层薄、埋藏深、分布不稳定、隐蔽性强等特点，在阐述测井约束反演原理、方法及关键参数的基础上，总结出包括合成记录在内的多元标定、初始阻抗的精细建立和反演方法的选择等方面的反演经验，并在实际应用中取得了良好的效果，为其他地区浊积砂体的储层预测及描述提供了借鉴经验。

V It is proved that, under quadratic loss, the admissibility of a common estimator of mean vector with respect to multivariate t-error model is related to its dimention.

v证明了多元t-分布均值向量的一个常用估计在二次损失下的可容许性与维数有关。

In modeling heavy tails,we focus on multivariate t distributions and derive the moment generating function of the quadratic approximation.Then we use Fourier transform,Chebychev's Inequality and numerical technique inversion to approximate VaR value of portfolio,compared with Cornish-Fisher Expansions normal model and Delta-Normal model.

在推导出多个外汇期权的投资组合的二次近拟的矩母函数表达式基础上，本文使用傅里叶变换、切比雪夫不等式、数值转换计算求出投资组合的VaR的值，并和基于多元正态分布Cornish-Fisher模型以及基于Delta-正态模型计算所得的VaR值了进行比较。

In this thesis we focused on the research of spectral distribution of large dimensional matrix and its application in multivariate statistical analysis.

本文的研究工作主要集中在大维样本协方差矩阵谱分布的理论研究及其在多元统计分析中的应用。

Pattern recognition, obedience multivariate normal distribution of a sample of the classifier is achieved.

模式识别中，对于服从多元正态分布的样本的一个分类器的实现。

Especially, we verify that copula method can obtain more practical VaR value than traditional model of multivariate normal distribution.

尤其是验证了借助连接函数理论，能够取得比传统的多元联合正态分布模型更符合实际的VaR数据。

We begin by investigating M—VaR model efficiency when security rates of returns have a multivariate normal distribution.

重点研究了收益率服从多元正态分布的最优投资组合均值—VaR模型在下述三种情形下的有效边缘。

Traditional portfolio theory based on multivariate normal distribution assumes that investors can benefit from diversification by investing in assets with lower correlations in order to avoid risk.

基于多元正态分布的投资组合理论认为，投资者可以通过投资于低相关性的不同资产规避风险，资产间的相关性可以通过线性相关系数来度量。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐