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1·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。

2·Another concept that's very basic here is covariance.

另一个基本的概念是协方差。

3·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。

4·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。

5·Significance and application of covariance functions are discussed.

对协方差函数的意义和应用做了讨论。

6·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。

7·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？

8·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。

9·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。

10·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。

(1)covariance matrix[计]协方差矩阵

(1)covariance analysis协方差分析；积差分析；共变量分析

(1)covariance function协方差函数；共变量函数；积差函数

(1)analysis of covariance共分散分析；协方差分析