指标名称

定义

公式

MAE

平均绝对误差

$\frac{1}{N}{\displaystyle \sum }_{i=1}^N\left|\left(y_i-{\widehat{y}}_i\right)\right|$

MSE

均方误差

$\frac{1}{N}{\displaystyle \sum }_{i=1}^N{\left(y_i-{\widehat{y}}_i\right)}^2$

RMSE

均方根误差

$\sqrt{\frac{1}{N}{\displaystyle \sum }_{i=1}^N{\left(y_i-{\widehat{y}}_i\right)}^2}$

R²

决定系数

$1-\frac{{{\displaystyle \sum }}_{i=1}^N{\left(y_i-{\widehat{y}}_i\right)}^2}{{{\displaystyle \sum }}_{i=1}^N{\left(y_i-{\overline{y}}_i\right)}^2}$