Nutrient retention and release in coarse woody debris of three important central European tree species and the use of NIRS to determine deadwood chemical properties

Forest Ecosystems

Table 2 Validation and independent validation statistics as well as number of samples used for NIRS model development

Variable	Validation set		Independent validation set				Number of samples (calibration/validation/independent validation)
Variable	R ²	RMSEP	R ²	RMSEP	RPD	Ranking according to Malley et al. (2004)
C	0.89	0.879	0.79	0.901	2.17	D	140/151/576
N	0.94	0.042	0.94	0.041	4.12	A/B⁺	135/146/585
P	0.87	0.0278	0.87	0.034	2.93	C	48/35/20
Lignin	0.99	1.14	0.98	1.55	6.79	A	48/36/22
Extractives	0.87	1.05	0.92	0.76	3.72	B	84*/22

*Crossvalidation; ⁺ Models were ranked “A” according to RPD value, but “B” in relation to R²