Table 1.

Performance of six models in predicting the improvement rate in UPDRS-III score by using nested cross-validation.

Model	MAE	MSE	r	p-value
OLS	21.14	862.94	0.05	0.75
Ridge regression	17.57	573.95	0.14	0.35
Lasso regression	14.29	411.83	0.33	0.02
GBRT	12.40	240.74	0.65	2.58E−07
SVR	16.06	398.57	0.28	0.05
ERT	13.12	282.13	0.59	6.67E−06