Annals of Forest Science

Table 2 Effect of independent (ENGLS) and simultaneous (NSUR) fitting on statistical estimates using models for biomass components and total biomass of individuals of Pinus elliottii Engelm.: leaves, branches, bole without bark, bole bark, root and total

From: Simultaneous estimation as alternative to independent modeling of tree biomass

Component	R ² _adj				Syx %
Component	ENGLS	NSUR	AD	PD (%)	ENGLS	NSUR	AD	PD (%)
Leaves	0.74	0.73	0.01	1.35	26.49	26.91	−0.42	−1.59
Branches	0.71	0.72	−0.01	−1.41	45.00	44.45	0.55	1.22
Bole	0.96	0.96	0.00	0.00	19.30	19.16	0.14	0.73
Bark	0.92	0.92	0.00	0.00	22.96	22.65	0.31	1.35
Root	0.90	0.90	0.00	0.00	23.15	22.77	0.38	1.64
Total	0.96	0.90	0.06	6.25	16.77	19.24	−2.47	−14.73
Component	CI				PI
Component	ENGLS	NSUR	AD	PD (%)	ENGLS	NSUR	AD	PD (%)
Leaves	1.26	1.24	0.02	1.50	6.26	2.69	3.57	57.02
Branches	4.06	2.98	1.08	26.60	17.32	11.40	5.92	34.18
Bole	10.48	6.46	4.02	38.36	43.24	37.90	5.34	12.35
Bark	1.85	2.21	−0.36	−19.46	9.34	4.93	4.41	47.22
Root	2.29	2.42	−0.13	−5.68	10.14	5.01	5.13	50.59
Total	19.14	7.94	11.20	58.52	58.11	51.59	6.52	11.22

Differences were calculated for the independent fitting, for example: CI AD_Total = 19.87 − 7.94 = 11.93 and \( \mathrm{C}\mathrm{I}\ {\mathrm{PD}}_{\mathrm{Total}} = \frac{11.93}{19.87}100=60.04\% \)
R ² _adj adjusted coefficient of determination, S _yx standard error of the estimate, CI confidence intervals, PI prediction intervals, AD absolute difference, PD percent difference

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ISSN: 1297-966X

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