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

von Bertalanffy-Richards

y = a(1-e^-bT)^c

Schumacher

$y=a{e}^{\left(-b{T}^c\right)}$

Weibull

$y=a\left(1-e^{-b{T}^c}\right)$