New Zealand Journal of Forestry Science

Table 7 Parameter estimates with standard errors for Type C regional forms of the Bertalanffy-Richards function

From: A National height-age model for Pinus radiata in New Zealand

Region	Common-asymptote				General polymorphic
Region	b _i		c _i		a _0i		b _0i
	Est.	S.E.	Est.	S.E.	Est.	S.E.	Est.	S.E.
Northland/Auckland	0.710	0.005	56.9	0.5	0.0329	0.0028	0.442	0.019
Waikato	0.684	0.004	58.1	0.3	0.0380	0.0026	0.381	0.018
Bay of Plenty	0.657	0.002	61.1	0.2	0.0295	0.0026	0.399	0.018
Gisborne	0.682	0.007	63.7	1.1	0.0228	0.0042	0.461	0.025
Hawkes Bay	0.677	0.004	60.5	0.5	0.0213	0.0030	0.474	0.019
Wanganui-Manawatu	0.653	0.007	60.4	0.7	0.0105	0.0025	0.537	0.018
Wellington	0.640	0.009	60.8	0.8	0.0139	0.0039	0.501	0.028
Marlborough	0.649	0.006	58.0	0.8	0.0253	0.0035	0.443	0.022
Nelson/Tasman	0.638	0.004	57.8	0.4	0.0341	0.0027	0.382	0.018
West Coast	0.631	0.007	52.7	0.6	0.0452	0.0034	0.355	0.020
Canterbury	0.629	0.005	49.5	0.5	0.0373	0.0031	0.412	0.018
Otago	0.594	0.005	54.6	0.5	0.0202	0.0023	0.467	0.017
Southland	0.641	0.007	54.6	0.7	0.0242	0.0046	0.463	0.027
Coastal sand	0.785	0.004	45.1	0.2	0.0457	0.0023	0.481	0.016
SI coefficient (a₁ and b₁)	-	-	-	-	8.73E-04	0.82E-04	7.04E-03	0.55E-03

Estimates are shown for the common-asymptote and general polymorphic forms (Equation 3).

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