Aboveground Biomass Models for Indigenous Tree Species in the Dry Afromontane Forest, Central Ethiopia

Table 6

Comparison of the species-specific allometric equation and generalized allometric equations against the observed value.

Species	Model references	RB	S (%)	rRMSE	Paired t test
					t statistics	value
R. ruspolii	New	−0.02	2	0.19	0.049	0.96
	[4]	0.04	4	0.30	1.55	0.14
	[19]	−0.27	27	0.44	−3.158	0.0069
	[10]	−0.45	45	0.62	−3.757	0.002
E. capensis	New	−0.01	1	0.12	0.117	0.91
	[4]	0.18	18	0.21	2.831	0.01
	[19]	−0.28	28	0.37	−3.622	0.002
	[10]	−0.52	52	0.63	−3.610	0.002
N. congesta	New	−0.01	1	0.14	0.269	0.79
	[4]	−0.22	22	0.34	−3.383	0.004
	[19]	−0.28	28	0.36	−4.293	0.0007
	[10]	−0.22	22	0.32	−3.543	0.003