Table 3. The estimated parameters and fit statistics of the models to predict the merchantable log utility rate to total stem volume for all types of cut-to-length logs including short- and long-length logs (MVS).

Equation	Type	Model	Parameter	Estimate	S.E.	t-value	Pr > |t|	R2	Syx	n
(3)	dob	MVS1	a1	−0.4146	0.0450	−9.22	<0.0001	0.5310	0.0275	191
			a2	2.2634	0.1512	14.97	<0.0001
	dib	MVS2	a1	−0.6161	0.0756	−8.15	<0.0001	0.3462	0.0582	191
			a2	1.2497	0.1316	9.49	<0.0001
(4)	dob	MVS3	a1	−0.2519	0.1298	−1.94	0.0539	0.5372	0.0274	191
			a2	2.2633	0.1773	12.77	<0.0001
			a3	2.1154	0.1619	13.06	<0.0001
	dib	MVS4	a1	−0.8526	0.3224	−2.64	0.0089	0.3571	0.0577	191
			a2	0.9794	0.1566	6.26	<0.0001
			a3	1.1944	0.1262	9.46	<0.0001