Overall main component, the overall calculation of the main component, the nature of the overall component, the main component of the covariance matrix and the total variance.
说明：总体主成分，总体主成分的计算，总体成分的性质，主成分的协方差矩阵及总方差。
Overall main component, the overall calculation of the main component, the nature of the overall component, the main component of the covariance matrix and the total variance.
说明：总体主成分，总体主成分的计算，总体成分的性质，主成分的协方差矩阵及总方差。
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