. 2017 Jan 9;12(1):e0169526. doi: 10.1371/journal.pone.0169526

Table 4. Prediction of ABC Total.

Correlation between ABC Total value and metal excretion using linear regression (no cross-validation & cross-validation) as well as nonlinear regression (cross-validation). Only the results for the highest R² values are shown, but other combinations of metals frequently had similar results.

# Variables	Linear Model			Nonlinear Model
	Metal Combinations	Max R² value		Metal Combinations	Max R² value
	Metal Combinations	No Cross-Validation	Cross-Validation	Metal Combinations	Max R² value
1	Cs	0.194	0.175	Cs	0.185
2	Cs/Hg	0.227	0.182	Cs/Hg	0.233
3	As/Cs/Sn	0.265	0.188	Cs/Ni/Sn	0.326
4	As/Cs/Ni/Sn	0.296	0.192	As/Hg/Ni/Sn	0.367
5	As/Cs/Hg/Ni/Sn	0.318	0.186	Cs/Hg/Ni/Pb/Sn	0.416
6	As/Cs/Hg/Ni/Sn /W	0.329	0.187	Cd/Cs/Hg/Ni/Pb/Sn	0.449
7	As/Cs/Hg/Ni/Sn /Tl/W	0.337	0.165	As/Cd/Cs/Hg/Ni/Pb/Sn	0.471
8	As/Cs/Hg/Ni/Pb/Sn /Tl/W	0.345	0.148	As/Cd/Cs/Hg/Ni/Pb/Sn/Tl	0.475
9	Al/As/Cs/Hg/Ni/Pb/Sn/Tl/W	0.345	0.118	As/Cd/Cs/Hg/Ni/Pb/Sn/Tl/W	0.406
10	all	0.345	0.062	All	0.327