和协

There are three traditional methods of estimating VaR: Covariance matrix, History simulation and Monte Carlo simulation.

估计VaR的传统方法有三种：协方差矩阵法、历史模拟法和蒙特仁洛模拟法。

Here we estimate and tune the background error covariance matrix which adapts to China region.

实际研究表明，背景场误差协方差在全球不同的区域，方差和特征长度各不相同。

Significance and application of covariance functions are discussed.

对协方差函数的意义和应用做了讨论。

Another emphasis in this study is analyzing the effect of change in the variance, covariance and different elasticity.

除此之外，为了更清楚了解金融市场对最优权重的影响，本文重点分析了分配给两国货币权重大小的比较以及方差、协方差和各种资产需求弹性的变化所引起的最优权重的变化。

A system model reduction method based on regional pole and covariance equivalent is proposed.

文中提出了一种基于极点分布和输出协方差匹配的随机系统模型降阶方法。

It is almost certain that genetic influences will be found, as will genetic covariance between entrepreneurship and other psychological traits.

几乎可以肯定的是，遗传的影响可以通过研究创业行为和其他心理特征的遗传协方差得以证明。

By the natural and harmonious relationship between differential forms and differential equations and between differential forms and vector analysis, we discuss the properties, which are covariant under the transformation of coordinates in the framework of differential forms, of particle motion in a central force field .

通过微分形式与微分方程和向量分析之间存在的自然而协调的关系，在微分形式框架下讨论了质点在有心力场中运动的特性并得出在坐标变换下其均是协变的

In Riemannian manifolds, one studies Riemannian metric, covariant derivative, Riemannian connection, basic properties of the Riemann curvature tensor, curvature forms etc.

黎曼流形部分主要涉及黎曼度量，黎曼流形的定义，切向量场的协变微分，黎曼联络，黎曼几何的基本定理，曲率张量，曲率形式等概念和理论。

According to Lorentz transformation,the relativistic covariant of electromagnetic field tensor and 4-dimension forces,and the relativistic invariance of electric charge,it can be directly proved that a moving magnetic monopole will be acted- by a magnetic Lorentz force ,and that the magnetic Lorentz force has the same accuracy as the Coulomb low.

概述了磁单极概念的历史发展，从洛伦兹变换出发，利用电磁场张量和四维力的协变性以及电荷相对论不变，直接证明了运动磁单极受磁洛伦兹力，建议了一个磁洛伦兹力的验证方案，并用磁洛伦兹力公式导出狄拉克电荷量子化条件。证明了磁洛伦兹力公式具有与库仑定律相同的精确度

In the analysis of J/ψ→γωω and J/ψ→γρρchannels we adopt the patial wave analysis of helicity corariant amplitude method for the first time, while in the analysis of J/ψ→γηππchannel the mature PWA of covariant tensor amplitude method is used.

我们在J/ψ→γωω和J/ψ→γρρ道首次利用了螺旋态振幅分波分析的方法，在J/ψ→γηππ道的分析中使用的是协变张量振幅分波法。

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。