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再补充个chatgpt的回复，感觉他说的比较通俗易懂： R Square（ R^2 ）和Pearson相关系数是两个不同的概念，但是它们之间存在一定的关系。
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线性回归的相关指数 R² 的表达式（见图）是怎么来的？ - 知乎
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业 …