Table 2.

Statistical parameters from external validation of the models for ternary and quaternary mixtures by adopting optimized wavelength ranges and 0.5 data interval.

Model	Analyte	PCs	RMSEP	RE (%)	r2	Slope	Offset
PCR	PAR	3	0.7268	4.6353	0.9971	0.9871	0.1345
	ASC	3	0.2414	3.2432	0.9961	0.9581	0.0154
	CHL	3	0.0374	9.1643	0.9933	0.9881	0.0013
	PAR	4	0.0725	0.7894	0.9999	1.0000	−0.0012
	CAF	4	0.1028	5.6284	0.9934	0.9826	0.0194
	CHL	4	0.1036	20.7917	0.9876	0.9505	0.0140
	PHE	4	0.1154	23.1650	0.9701	0.9397	0.0182
PLS1	PAR	3	0.3707	2.3643	0.9992	0.9969	−0.0032
	ASC	3	0.0907	2.9851	0.9994	0.9899	−0.0015
	CHL	3	0.0136	3.2816	0.9991	0.9937	0.0017
	PAR	4	0.1942	2.1152	0.9996	0.9982	0.0023
	CAF	4	0.0894	3.3802	0.9951	0.9752	0.0195
	CHL	4	0.0589	4.8168	0.9897	0.9716	0.0026
	PHE	4	0.0636	3.6352	0.9913	0.9885	−0.0019
PLS2	PAR	3	0.7017	3.4754	0.9983	0.9944	−0.0178
	ASC	3	0.0894	2.9423	0.9994	0.9962	−0.0012
	CHL	3	0.0360	5.7047	0.9936	0.9914	0.0024
	PAR	4	0.1707	1.8594	0.9997	0.9982	0.0007
	CAF	4	0.1721	6.1228	0.9907	0.9817	0.0328
	CHL	4	0.0739	5.8295	0.9840	0.9720	0.0132
	PHE	4	0.0667	5.3928	0.9969	0.9869	−0.0015
MCR	PAR	3	0.6921	4.4141	0.9974	0.9940	−0.0120
	ASC	3	0.0844	3.7808	0.9984	0.9962	−0.0013
	CHL	3	0.0145	5.5077	0.9990	0.9928	0.0025
	PAR	4	0.1598	1.7400	0.9998	0.9989	−0.0076
	CAF	4	0.1007	6.4332	0.9976	0.9655	0.0179
	CHL	4	0.0607	8.1726	0.9921	0.9903	0.0029
	PHE	4	0.0372	7.4667	0.9960	1.0021	−0.0070