Table 4.

Classification results, correct classification (%). Pine heartwood/sapwood and birch bark/wood, 5 classes: 0, 25%, 50%, 75% and 100% mix ratios. Classification by using decision tree (DT), support vector machine (SVM) and K-nearest neighbor (KNN). N = number of samples.

Material/ MC Range (%)	DT (%)	SVM (%)	KNN (%)	N
Pine
0-60	41	35	30	97
30-60 *	30	65	73	40
Birch
0-60	34	40	37	123
30-60	61	66	66	61

* Four classes—MC of heartwood samples was below 30%.