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https://blog.csdn.net/wangxin1982314/article/details/72152584
https://blog.csdn.net/shijing_0214/article/details/50866477
https://baike.baidu.com/item/%E7%9A%AE%E5%B0%94%E9%80%8A%E7%9B%B8%E5%85%B3%E7%B3%BB%E6%95%B0/12712835?fromtitle=%E7%9A%AE%E5%B0%94%E9%80%8A%E7%B3%BB%E6%95%B0&fromid=16955304&fr=aladdin
皮尔逊系数
原文地址：https://www.cnblogs.com/654321cc/p/9643738.html
