“covariance matrix”的概念、定义、翻译、参考文献-科学参考

单词	covariance matrix
释义	covariance matrix Mathematics See hypothesis testing. Statistics Alternative name for variance-covariance matrix. Economics For a vector of random variables X = [X₁…X_n], a matrix of variances of each component along the main diagonal and covariances between all pairs of components in non-diagonal elements. The covariance matrix is defined by $Σ = E [(X - E (X)) {(X - E (X))}^{T}]$ so that $Σ_{i i} = Var (X_{i}) and Σ_{i j} = Cov (X_{i}, X_{j}) .$
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