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. 2023 Oct 19;23(20):8585. doi: 10.3390/s23208585

Table 2.

Noise reduction analysis of spectral data.

Pretreatment Method	Forecasting Method	Wavelength (nm)	Training Set		Prediction Set
Pretreatment Method	Forecasting Method	Wavelength (nm)	RMSE_c	R_c²	RMSE_p	R_p²
MSC	ETR	515	0.3429	0.9905	1.5670	0.8035
	RFR		0.7061	0.9596	1.5826	0.7995
	BAR		0.8010	0.9480	1.5777	0.8008
SNV	ETR	515	0.3429	0.9905	1.5670	0.8035
	RFR		0.7061	0.9596	1.5826	0.7995
	BAR		0.8010	0.9480	1.5777	0.8008
DWT	ETR	555 590 555	0.0720	0.9996	2.3676	0.5513
	RFR		0.7567	0.9536	2.2347	0.6002
	BAR		1.0597	0.9089	2.2184	0.6061
SG	ETR	515	0.3429	0.9905	1.5670	0.8035
	RFR		0.7062	0.9595	1.5798	0.8002
	BAR		0.8010	0.9480	1.5777	0.8008
MinMax	ETR	515	0.3429	0.9905	1.5670	0.8035
	RFR		0.7044	0.9598	1.5798	0.8002
	BAR		0.7989	0.9482	1.5777	0.8008
OD	ETR	590	0.1737	0.9971	1.8834	0.6074
	RFR		0.7179	0.9508	1.7394	0.6651
	BAR		0.8133	0.9369	1.7986	0.6419
PBOR	ETR	515	0.3618	0.9894	1.5813	0.7998
	RFR		0.7106	0.9590	1.5853	0.7988
	BAR		0.8079	0.9471	1.5679	0.8032
CR	ETR	515	0.3429	0.9905	1.5670	0.8035
	RFR		0.7061	0.9596	1.5826	0.7995
	BAR		0.8010	0.9480	1.5777	0.8008