$$ \text{RSE}=\frac{\sum^n_{i=1}(y_i-\hat{y}i)^2}{\sum^n{i=1}(y_i-\bar{y})^2} $$
The relative squared error is another version of the relative absolute error, just as mean squared error is another version of mean absolute error.
6.5 Eval. Metric 4: Relative Absolute Error
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