主成分分析 - SERP Analysis

https://zh.wikipedia.org/zh-hans/%25E4%25B8%25BB%25E6%2588%2590%25E5%2588%2586%25E5%2588%2586%25E6%259E%2590

https://zhuanlan.zhihu.com/p/37777074

https://leemeng.tw/essence-of-principal-component-analysis.html

https://blog.csdn.net/MoreAction_/article/details/107463336

https://www.ibm.com/cn-zh/think/topics/principal-component-analysis

https://www.math.pku.edu.cn/teachers/lidf/course/mvr/mvrnotes/html/_mvrnotes/mvr-pca.html

https://www.cnblogs.com/lsm-boke/p/11760224.html

https://solour-lfq.github.io/papers/pca.pdf

https://www.reddit.com/r/statistics/comments/2yp3tl/can_someone_please_explain_principal_component/%3Ftl%3Dzh-hans

https://blogs.sas.com/content/sastaiwan/2020/02/25/%25E4%25B8%25BB%25E6%2588%2590%25E5%2588%2586%25E5%2588%2586%25E6%259E%2590/