EOF 分析，EOF本身就是多元统计分析中的主分量分析PCA在气象场序列中的应用，多元正态变量X(x1,x2,x3,..,xp)可理解为空间上网格点资料序列，也可理解为任何一组具有不同物理意义的多元正态变量。(EOF itself is the application of principal component analysis PCA in the field of meteorological statistics. Multivariate normal variable X (x1, X2, X3,..., XP) can be understood as spatial grid data sequence, and it can also be understood as any group of multivariate normal variables with different physical meanings.)