A New Hybrid Model for Hourly Solar Radiation Forecasting Using Daily Classification Technique and Machine Learning Algorithms

Table 4

The daily comparison between the ML models.

Error metrics	Sunny days ()				Cloudy days ()
	ANN	SVR	GB	RF	ANN	SVR	GB	RF
RMSE (W/m^2)	40.77	38.80	40	39	85.56	87.05	86.91	85.77
nRMSE (%)	9.61	9.15	9.57	9.36	42.09	42.82	42.75	42.19
MAE (W/m^2)	22.47	19.72	23.18	21.03	51.02	51.58	51.55	50.19
nMAE (%)	5.30	4.65	5.46	4.96	25.1	25.37	25.36	24.69
AIC	3846	24947	3231	19113	3332	20790	2737	18631