Table 7. Fifty-four wavenumber variables aligned by wavelength of the XGBoost and Boosted Tree reduced models.

Group	Wave number variable			XGBoost		Boosted Tree
	Variable name	Wave number (cm−1)	Wavelength (nm)	Main effect	Total effect	Main effect	Total effect
Group I (811~1,088 nm)	ab12327	12,327	811			0.0069	0.0278
	ab12311	12,311	812			0.0519	0.1307
	ab12296	12,296	813	0.0092	0.0188
	ab12265	12,265	815	0.0431	0.086
	ab11926	11,926	839	0.0074	0.0159
	ab11741	11,741	852	0.0127	0.0274
	ab11617	11,617	861			0.0181	0.0712
	ab11540	11,540	867			0.0081	0.0276
	ab11509	11,509	869	0.0183	0.0477
	ab11478	11,478	871			0.0127	0.0436
	ab11262	11,262	888			0.0034	0.01
	ab11231	11,231	890	0.0118	0.0268	0.0089	0.0326
	ab10923	10,923	915	0.0098	0.0212
	ab10738	10,738	931	0.0242	0.0573
	ab10306	10,306	970			0.0085	0.0268
	ab10229	10,229	978			0.0317	0.0966
	ab10028	10,028	997			0.0694	0.1987
	ab9920	9,920	1,008	0.0171	0.0402
	ab9905	9,905	1,010			0.0128	0.0489
	ab9812	9,812	1,019			0.0099	0.0359
	ab9735	9,735	1,027			0.0049	0.0142
	ab9689	9,689	1,032	0.0219	0.0442
	ab9195	9,195	1,088			0.0274	0.0977
Group II (1,137~1,273 nm)	ab8794	8,794	1,137	0.023	0.0519	0.0146	0.0477
	ab8778	8,778	1,139	0.0159	0.0327
	ab8115	8,115	1,232	0.0191	0.045
	ab7976	7,976	1,254			0.0023	0.0084
	ab7853	7,853	1,273			0.0084	0.0261
Group III (1,336~1,453 nm)	ab7482	7,482	1,336	0.0095	0.0212
	ab7467	7,467	1,339			0.0052	0.0207
	ab7451	7,451	1,342			0.0051	0.0186
	ab7328	7,328	1,365	0.0332	0.0741
	ab7297	7,297	1,370			0.0154	0.0666
	ab7004	7,004	1,428	0.0895	0.1833	0.0136	0.0423
	ab6881	6,881	1,453	0.0472	0.1000	0.0351	0.1033
Group IV (1,666~1,671 nm)	ab6001	6,001	1,666	0.0884	0.1861
	ab5986	5,986	1,671			0.0165	0.0618
Group V (1,879~2,045 nm)	ab5322	5,322	1,879	0.0232	0.0606
	ab5276	5,276	1,895			0.0047	0.0185
	ab5261	5,261	1,901	0.0096	0.0278
	ab5230	5,230	1,912	0.0176	0.0604	0.0171	0.0494
	ab5183	5,183	1,929			0.0168	0.0473
	ab5168	5,168	1,935	0.0488	0.0986	0.0193	0.0652
	ab5153	5,153	1,941			0.0206	0.0671
	ab5137	5,137	1,946	0.0382	0.0690
	ab5075	5,075	1,970	0.0056	0.0136
	ab4890	4,890	2,045	0.0069	0.0141
Group VI (2,058~2,409 nm)	ab4859	4,859	2,058	0.0291	0.0581
	ab4844	4,844	2,064	0.0177	0.0376
	ab4751	4,751	2,104			0.0211	0.0935
	ab4474	4,474	2,235			0.006	0.0226
	ab4196	4,196	2,383			0.023	0.0771
	ab4181	4,181	2,392			0.0075	0.0245
	ab4150	4,150	2,409	0.0567	0.1326	0.0518	0.1597