APE (%) =\(\ \frac{|predicted\ \text{AUC}_{0-6h}-\text{actual}\ \text{AUC}_{0-6h}|\ }{\text{actual}\ \text{AUC}_{0-6h}}\ \times\ 100\)% (2)
MAPE (%) =\(\ \frac{1}{N}\sum{(\frac{|predicted\ \text{AUC}_{0-6h}-\text{actual}\ \text{AUC}_{0-6h}\ |}{\text{actual}\ \text{AUC}_{0-6h}}\ \times\ 100\%)}\) (3)
rRMSE (%) = \(\frac{1}{N}\sqrt{\sum{(\frac{\text{predicted\ }\text{AUC}_{0-6h}-\text{actual}\ \text{AUC}_{0-6h}\ }{\text{actual}\ \text{AUC}_{0-6h}}\ \times\ 100\%)}^{2}}\) (4)