Linking acoustic velocity of standing Douglas-fir trees to veneer stiffness: a tree-log-product study across thinning treatments

New Zealand Journal of Forestry Science

Table 5 Fit statistics of simple regression models, Y = a + bX, predicting mean stiffness of the butt veneer bolt (MOE _L ) from tree variables

Explanatory variable	Symbol	a	b	SE(a)	SE(b)	p-value	R²
Velocity	V	-0.704	2.94	3.85	0.97	0.004	0.16
Diameter at breast height	D	13.8	-0.072	1.07	0.027	0.009	0.13
Taper	T	13.7	-2.17	1.03	0.82	0.011	0.12
Velocity-squared	V²	5.06	0.375	1.94	0.121	0.003	0.16
Velocity-squared, intercept suppressed	V²	0.00	0.688	na	0.015	0.121	0.05