Table 12. Validation result of the regression equation using the test data in felling and processing.

Operations and species		n	D ¯	S D ¯	t	Prob>|t|
Felling and processing	Pinus rigida	13	−28.84723	14.83594	−1.944	0.076
	Quercus mongolica	12	−0.29167	18.73496	−0.016	0.988
Felling	Pinus rigida	24	7.07917	6.75630	1.048	0.306
	Quercus mongolica	9	−0.81111	10.08065	−0.080	0.938
Processing	Pinus rigida	48	−14.29583	10.42140	−1.372	0.177
	Quercus mongolica	43	−11.12558	16.47783	−0.675	0.503