关于高次多项式拟合，R2怎么求? - 知乎
1. 对于高次多项式拟合（或任何线性回归模型）， R 2 的计算公式是通用的 先说结论， R 2 是用来衡量拟合曲线对原曲线信息解释程度的一个指标， 对于高次多项式拟合（或任何线性回归模型）， R 2 …
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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
y-yi为残差，描述的是实际值与预测值的差异，是对模型优劣的一种评价，但是，这个还不够，因为，结果会因为正负抵消掉这种差异性，所以，需要用平方来消除这种差异，也就是分子， 另外，其中分 …
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