Table 3.

Relative improvement coefficients of ELM-AE-R vs. PCR and PLSR.

	ELM-AE-R vs. PCR		ELM-AE-R vs. PLSR
	Training	Testing	Training	Testing
RMSE	9.60%	18.54%	−19.67%	18.05%
R2	3.32%	8.12%	−8.15%	2.08%