网络释义专业释义英英释义
...View more [转载]特征值、特征向量和PCA的概念及理解 特征值分解和主成份分析 协方差矩阵 协方差(Covariance)用于衡量两个变量的总体误差。设两个随机变量X和Y的期望值分别为E(X)和E(Y),则其协方差定义为： .
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相关变量 associated variates; correlated variables; correlation variable; covariance 有关变量 related variable 控制无关变异量 control extraneous variance .
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lorentz covariance 洛伦兹协变性 ; 劳仑兹协变性 ; 洛性
covariance matrix [数] 协方差矩阵 ; 共变异数矩阵 ; 共变数矩阵
covariance function [数] 协方差函数 ; 积差函数 ; 共变量函数
Multiple covariance 多元协方差 ; 多重方差
cross covariance 互协方差 ; 交叉协方差
sample covariance [数] 样本协方差 ; 协方差 ; 样本共变异数 ; 样本均方差
population covariance [数] 总体协方差 ; 族群共变异数
covariance method [数] 协方差法 ; 共变法
complex covariance [数] 复协方差
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协方差 - 引用次数：169
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。
参考来源 - 随机奇异系统多传感器信息融合Kalman多步预报器共同变异数 -
协方差 - 引用次数：24
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。
参考来源 - 食用稻米主要重金属元素含量的遗传及其与环境互作效应 -
协同变化 - 引用次数：2
On covariance relations between recovery procedure of degenerated vegetation and the environment are difficult to research of succession.
有关退化植被恢复过程与环境的协同变化关系是演替研究的难点。
参考来源 - 退化喀斯特植被恢复与生境协变关系研究协方差 -
协变 - 引用次数：2
Based upon the requirement of covariance of the geometrical quantities,Guo et al proposed the covariant theory for the prolongation structure by means of the connection theory of fiber bundles,thus making the whole theory covariant.
基于几何量的协变性要求，郭汉英等人通过纤维丛上联络的理论提出了协变的延拓结构理论，从而使得整个理论成为协变的。
参考来源 - 可积反应—扩散方程协变延拓结构的研究 -
共变 - 引用次数：4
The forth chapter induces and analyses social reasons of Russian loanwords. According to discussing the different phenomena of Russian loanwords to prove that the phenomena of Russian loanwords accords with the theory of covariance.
第四章分析了俄语外来词借入的社会动因,通过外来词借入社会动因的共时和历时分析来进一步论证俄语外来词现象符合社会语言学中语言与社会“共变”理论。
参考来源 - 社会语言学视角的俄语外来词研究 -
协方差 - 引用次数：8 参考来源 - 背景场误差的结构特征及其对三维变分同化影响的研究共变异数
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协变性共方差
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协方差
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共方差
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covariance [ kəu'vεəriəns ]
- n. (statistics) the mean value of the product of the deviations of two variates from their respective means
以上来源于: WordNet
柯林斯英汉双解大词典
covariance /kəʊˈvɛərɪəns/
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1.
N a measure of the association between two random variables, equal to the expected value of the product of the deviations from the mean of the two variables, and estimated by the sum of products of deviations from the sample mean for associated values of the two variables, divided by the number of sample points. Written as Cov (X, Y) 协方差 [statistics]
双语例句原声例句
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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。
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Another concept that's very basic here is covariance.
另一个基本的概念是协方差。
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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。
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One more thing, I said they're not independent, so we have to talk about the covariance between the returns.
还有，我说过它们不是相互独立的，因此我们还需要讨论两个收益率的协方差。
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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
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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
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