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Table 2 Three sigmoidal growth functions (in yield form) from which mean top height and basal area models were developed

From: Growth and productivity of New Zealand kauri (Agathis australis (D.Don) Lindl.) in planted forests

Equation
von Bertalanffy-Richards y = a(1-e-bT)c
Schumacher y=a e - b T c
Weibull y=a 1 - e - b T c