Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa

Table 2

Selected total stem volume models, parameter estimates, standard errors (SE), and statistic measures of fit for P. patula and P. oocarpa.

Species	Pinus patula		Pinus oocarpa
Estimated parameters
		0.0000712		0.0000368
SE	0.0252	0.0000029	0.0166	0.0000022
	0.951		0.869
RMSE	0.076		0.046
AIC	92.07		45.83
CF	1.003		1.001
values	<0.001		<0.001
Model (corrected by CF)

Note. is the intercept; is the gradient of the predictor variable; is the adjusted coefficient of determination; CF(σ) is the correction factor; dbh is the diameter at breast height; and ht is the total tree height; ln is the natural logarithm; is volume of a tree.