另一个基本的概念是协方差。
负值的协方差就表示，二者反向变动。
A negative covariance means that they tend to move opposite each other.
很多个负值的结果相加，就会使协方差是一个负值。
If you get a lot of negative products, that makes the covariance negative.
协方差衡量的是两个变量一起变动的情况。
Covariance is a measure of how much two variables move together.
利用协方差矩阵的特征值。能实现信号和噪声的分解。
The eigenvalue of covariance matrix can be used to separate signal from noise.
其中，对于观测向量协方差阵的谱分解估计，我们很容易得到它在一些损失下的风险函数。
Thereinto, for the spectral decomposition estimate of the covariance matrix , we can gain the risk functions under some losses.
用天线阵归一化广义阻抗矩阵表示单元互耦，分析了考虑单元互耦效应的自适应天线协方差矩阵的特点。
By using the arrays normalized general impedance matrix to express the mutual coupling between the elements, the characteristics of the covariance matrix of the adaptive arrays are analyzed.
通过采用一组预置协方差的随机数模拟雷诺应力来表示随机的湍流流场。
The stochastic turbulent field is represented by a set of random Numbers with a pre - set covariance simulating the Reynolds stress in a turbulent flow.
这里有一个r1和r2之间的协方差，你也可以叫它σ12，which，you，can，also，call，σ,这些就是我们分析所需要的信息。
So, we're going to have the covariance between r1 and r2, 12 and those are the inputs to our analysis.
如何绘制一个高斯分布的协方差矩阵的轮廓？
How to plot contour of a covariance matrix of a gaussian distribution?
因为这时模型协方差阵结构仍含有方差参数，因此我们的目标是寻求可行估计。
The variance-covariance matrix still include parameter of variance in this condition, so our purpose is to look for feasible estimations.
为解决目标跟踪精度与观测时间间隔的矛盾，提出了一种基于目标状态估计协方差控制的观测时间确定算法。
To solve the contradiction between target tracking accuracy and observation interval, an algorithm of calculating observation time based on target estimate covariance control was presented.
推广的序贯估算法有两种形式：1。积分误差协方差矩阵，2。积分状态转移矩阵。
There are two forms of extended sequential estimation algorithm: 1. integrating error covariance matrix; 2. integrating state transition matrix.
对协方差函数的意义和应用做了讨论。
Significance and application of covariance functions are discussed.
最后，我们还研究了一般生长曲线模型在不同可预测变量下的简单投影预测关于协方差阵的稳健性。
Finally, robustness of the simple projection predictor in the general growth curve model with different linear predictable variable on the covariance matrix are investigated.
讨论了不同湍流强度、波长和传播距离对强度协方差函数和归一化强度方差的影响。
The influence of turbulence strength, wavelength and propagating distance on the covariance function and normalized variance of the scattering intensity is discussed.
在卫星的状态估计过程中应用推广的序列估计算法，借助数值积分方法积分状态向量和协方差矩阵。
For the estimation of satellite state, the extended sequential estimation algorithm was applied. The numerical method was used to integrate state vector and error covariance matrix.
研究单个矢量水听器的噪声协方差矩阵，并给出了浅海近岸水域的试验结果；
Noise covariance matrix of a single vector hydrophone is studied with experiment results in the shallow water.
结果表明，协方差函数可以反映出体重在连续的年龄尺度上的遗传和表型变异。
The results showed that covariance functions could reflect the changes of genetic and phenotypic variation for body weight in continuous scale of age.
同时给出了任两个传感器之间的预报误差协方差阵的计算公式。
The computation formulas for the prediction error covariance matrix between any two subsystems are given.
从效果上看，格点法接近协方差法，但较自相关法有明显地改善。
The effect of lattice filtering is comparable to covariance method, but much better than autocorrelation method.
基于协方差控制策略研究了相控阵雷达搜索及跟踪方式下的资源管理问题。
The problem of resource management in search and track mode for phased array radars is considered based on covariance control.
采用EWMA模型预测动态变化的方差-协方差矩阵，从实证的角度得到更精准的动态迁移相关系数矩阵。
Using EWMA to forecast the portfolio's dynamic transferred variance-covariance matrix, we can get more reasonable and precise dynamic transferred coefficient matrix.
并采用协方差结构模型分析方法，对这些因素进行了实证研究。
Further using Covariance Structure Model, we make an empirical analysis of these factors.
提出了用于得到最优加权系数的局部滤波误差方差和协方差计算公式。
The formula of computing variance and covariance among local filtering errors is presented, which is applied to obtain the optimal weighting coefficients.
也为采用某些数学方法(如协方差描述函数法)进一步研究火箭发射系统的统计性能作了必备的前提工作。
So the study makes an easy way for launching research of MLRS and prepares for applying some mathematics methods (such as CADET) in the statistic field of MLRS.
本文的结果也显示了协方差改进方法的有效性。
The results obtained in this paper show also the power of the covariance adjusted approach.
本文还介绍了隐周期和协方差阵理论以及用它们来分析测井信号。
In this paper, we offer the theories of hide periods and covariance matrix and use them to identify the fluid property of reservoir.
本文还介绍了隐周期和协方差阵理论以及用它们来分析测井信号。
In this paper, we offer the theories of hide periods and covariance matrix and use them to identify the fluid property of reservoir.
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