名词
中文翻译：Unknown
同义词：
['covariance matrix', 'correlation matrix', 'residual variance matrix']
例句：
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1. In statistics, the variance matrix is used to calculate the standard deviation of a dataset.
在统计学中，方差矩阵用于计算数据集的标准差。
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2. The covariance matrix helps us understand how variables are related to each other.
协方差矩阵有助于我们理解变量之间的相互关系。
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3. The correlation matrix shows the strength and direction of the relationship between two variables.
相关矩阵显示两个变量之间强度和方向的关系。