equivalent covariance matrix
... 伪协方差矩阵 pseudo-covariance 等价协方差矩阵 equivalent covariance matrix 因素协方差矩阵 factor covariance matrix ...
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该等价协方差矩阵和等价权矩阵不仅保持了原有协方差矩阵和权矩阵的对称性，而且保持了原有协方差矩阵的相关性不变。
It is shown that the new equivalent covariance matrix and weight matrix keep not only the symmetry but also the relevance of the original covariance matrix.
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