Table 2.

Out-of-sample performance for XGBoost model on five substrates.

Test sample	Substrate	Dye	Concentration (M)	Power (mW)	Accuracy	Precision	Recall	F1	AUC	MCC	Fraction positive
11	Moxtek	R6G	1.00E-08	20	0.90	NA	NA	NA	0.96	NA	0.10
2	Moxtek	R6G	3.00 E-03	10	0.77	0.78	0.98	0.87	0.83	0.27	0.75
3	Plasmore	R6G	1.00E-08	20	0.95	0.91	0.64	0.75	0.99	0.74	0.12
4	Plasmore	R6G	3.00 E-03	10	0.72	0.78	0.73	0.75	0.80	0.42	0.60
5	Plasmore	R6G	1.00E-08	10	0.98	0.98	1.00	0.99	0.69	0.00	0.98

^1.For sample 1, no false positives or true negatives were generated making the precision, recall, F1, and MCC formula inapplicable.