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 4 Fit statistics of simple regression models, Y = a + bX, predicting mean tree stiffness (MOE _T ) from tree variables

Explanatory variable	Symbol	a	b	SE(a)	SE(b)	p-value	R²
Velocity	V	-4.18	3.77	5.58	1.38	0.011	0.21
Diameter at breast height	D	14.8	-0.101	1.37	0.0367	0.010	0.21
Taper	T	17.7	-6.34	2.01	1.92	0.003	0.28
Velocity-squared	V²	3.38	0.467	2.82	0.170	0.010	0.21
Velocity-squared, intercept suppressed	V²	0.00	0.670	na	0.019	0.020	0.17