The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.

协变和逆变的区别对于张量的计算尤为重要，这往往会出现混合方差。

Another concept that's very basic here is covariance.

另一个基本的概念是协方差。

Covariance is a measure of how much two variables move together.

协方差衡量的是两个变量一起变动的情况。

A negative covariance means that they tend to move opposite each other.

负值的协方差就表示，二者反向变动。

Significance and application of covariance functions are discussed.

对协方差函数的意义和应用做了讨论。

If you get a lot of negative products, that makes the covariance negative.

很多个负值的结果相加，就会使协方差是一个负值。

How to plot contour of a covariance matrix of a gaussian distribution?

如何绘制一个高斯分布的协方差矩阵的轮廓？

Covariance analysis with forward stepwise variable selection was carried out.

统计方法采用逐步向前变量选择协方差分析。

The eigenvalue of covariance matrix can be used to separate signal from noise.

利用协方差矩阵的特征值。 能实现信号和噪声的分解。

Objective To study the effect of covariate imbalance on analysis of covariance.

目的探讨协变量的不均衡对协方差分析的影响。

The estimation of noise covariance matrix is based on iterative procedure in ML.

最大似然法采用了迭代的方法来估计噪声的协方差矩。

We can get the ellipticity and linearity from the eigenvalues of the covariance matrix.

由矩阵的特征值，求取椭圆率和线性因子。

Further using Covariance Structure Model, we make an empirical analysis of these factors.

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。

Covariance analysis was used to analyze herbicide efficacy data from rapeseed experiments.

摘要采用协方差分析方法，对油菜田除草剂的试验结果进行了分析。

An improved measuring method, the so-called eddy covariance method, recently became available.

最近开始应用的是一种改进的测量方法，所谓的涡度相关法。

Further Broof on the Equivalence of the Formulas of Variance-covariance Component Estimation.

方差-协方差分量估计公式等价性的进一步证明。

So, we're going to have the covariance between r1 and r2, 12 and those are the inputs to our analysis.

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。

According to the frequency spectrum and covariance, the blur strength of the blurred image is evaluated.

根据模糊图像的频谱和协方差特性估计模糊图像的模糊度。

The computation formulas for the prediction error covariance matrix between any two subsystems are given.

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。

In this paper, we consider the diagnostics for the mean and covariance parameters in longitudinal data model.

本文主要研究了纵向数据模型的均值参数和方差参数的统计诊断问题。

Noise covariance matrix of a single vector hydrophone is studied with experiment results in the shallow water.

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；

The effect of lattice filtering is comparable to covariance method, but much better than autocorrelation method.

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。

Thereinto, for the spectral decomposition estimate of the covariance matrix , we can gain the risk functions under some losses.

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。

Analysis on genetic covariance proved that genotype covariance was detected to be positive between these 5 heavy metal contents.

遗传协方差分析结果表明，5个重金属元素含量间的基因型协方差均为正向。

Covariance velocity spectrum is based on the fact that the sampled data can be arranged in eigen structure of covariance matrix.

协方差速度谱是基于采样数据可以排列成协方差矩阵的特征结构而设计的。

Adaptive fittings for both the systematic errors and covariance matrices of the model errors by using moving Windows are presented.

本文提出了一种基于移动窗口的函数模型和随机模型系统误差自适应拟合法。

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。

The variance-covariance matrix still include parameter of variance in this condition, so our purpose is to look for feasible estimations.

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。