sample covariance [数] 样本协方差 ; 协方差 ; 样本共变异数 ; 样本均方差
sample covariance matrix 样本协方差阵 ; [数] 样本协方差矩阵 ; 称为样本协方差矩阵 ; 差矩阵S
sample covariance function [数] 样本协方差函数
sample covariance coefficient [数] 样本协方差系数
Sample covariance and correlation 协方差与相关性 ; 样本协方差和相关性
fuzzy sample covariance 模糊样本协方差矩阵
the sample covariance matrix 总体样本协差阵
sample covariance matrix positive definiteness 样本协差阵正定性
sample variance-covariance matrix 样本方差 ; 样本方差协方差矩阵
covariance matrix of sample 样本协方差矩阵
This approach, unlike the conventional statistical techniques requiring for a covariance matrix of sample, is based on direct spatial processing of the array data.
这种方法不同于传统的统计方法需要计算样本协方差矩阵的逆矩阵，而是基于阵列数据的一种直接计算方法。
However, there have been few outcomes about the positive definitiveness of covariance matrix, most of which have been restricted to the Covariance-matrix of continuous sample.
然而，目前国内外有关协方差矩阵正定性的研究结果并不多，并且大多是集中在连续型样本协方差矩阵方面。
However, these methods are estimated according to sample variance and covariance estimators of returns.
然而，这些方法都是根据样本的变异数或报酬的共变异数估算的估计值。
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