有两组数据，Real_Values 是真实值，Predict_Valus 是预测值，请问如何计算他们的 R 方值？
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 | 1 skyqqcc Nov 4, 2018 原谅我看不懂 |
 | 2 meefly Nov 4, 2018 1. 计算协方差 Cov = E[(R - mean_R)(P - mean_P)] 2. 计算方差 Var_R , Var_P 3. R^2 = Cov^2/abs(Var_R*Var_P) (注意是协方差的平方) |
| 3 meefly Nov 4, 2018  1 没看到是 python， from sklearn.metrics import r2_score r2 = r2_score(Real_Values , Predict_Values ) |
 | 4 acone2003 OP 谢谢 meefly 大神！ |
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