Table 4.

Prediction accuracy of the stacked model.

AI Scenario	Subgroup	AARD%	MAE	RAE%	MSE	R 2
Stacked model	Internal	9.46	3.18 × 10−11	2.66	1.51 × 10−20	0.99791
	External	5.35	1.62 × 10−11	1.44	2.66 × 10−21	0.99946
	All data	8.62	2.86 × 10−6	2.42	1.26 × 10−10	0.99809