Modelling canopy fuel variables in Pinus pinaster Ait. and Pinus radiata D. Don stands in northwestern Spain

Table 6 Parameter estimates and goodness-of-fit statistics for the models relating parameters of the Weibull distribution function to stand variables

Species	Equation	R ²	RMSE	Condition number
P. pinaster	\( {\delta_0}=0.203+0.0935\cdot G \)	0.988	0.109	5.85
	\( {\delta_1}=0.429+0.642\cdot {H_0} \)	0.935	0.528	8.06
	\( {\delta_2}=1.01+0.0888\cdot {H_0}+0.0612\cdot {d_q} \)	0.739	0.274	16.6
P. radiata	\( {\delta_o}=0.338+0.0965\cdot G \)	0.979	0.141	7.76
	\( {\delta_1}=-2.09+0.756\cdot {H_0} \)	0.985	0.449	8.59
	\( {\delta_2}=2.47+0.0117\cdot {H_0}+0.0142\cdot {d_q} \)	0.585	0.139	17.9

G stand basal area (square metres per hectare); H ₀ dominant height (metres), d _q quadratic mean diameter (centimetres)

ISSN: 1297-966X