Developing Machine Learning Techniques to Investigate the Impact of Air Quality Indices on Tadawul Exchange Index

Table 6

CHAID and CR-Tree prediction results analysis.

	CR-Tree			CHAID
	Train	Test	Validate	Train	Test	Validate
R ^2	0.995	0.972	0.962	0.979	0.986	0.994
MSE	20,240	104,592	149,478	79,746	51,581	21,717
MAE	103	228	255	182	166	112
MBE	0.000	−63.707	41.184	18.177	4.452	21.737
RMSE	142	323	387	282	227	147