Author(s)

Purnachandra Rao Koya, Ayele Taye Goshu

School of Mathematical and Statistical Sciences, Hawassa University, Hawassa, Ethiopia.

In this paper, we present a generalization of the commonly used growth models. We introduce Koya-Goshu biological growth model, as a more general solution of the rate-state ordinary differential equation. It is shown that the commonly used growth models such as Brody, Von Bertalanffy, Richards, Weibull, Monomolecular, Mitscherlich, Gompertz, Logistic, and generalized Logistic functions are its special cases. We have constructed growth and relative growth functions as solutions of the rate-state equation. The generalized growth function is the most flexible so that it can be useful in model selection problems. It is also capable of generating new useful models that have never been used so far. The function incorporates two parameters with one influencing growth pattern and the other influencing asymptotic behaviors. The relationships among these growth models are studies in details and provided in a flow chart.

Growth Model; Koya-Goshu Function; Gompertz, Logistic; Richards; Weibull

Koya, P. and Goshu, A. (2013) Generalized Mathematical Model for Biological Growths. Open Journal of Modelling and Simulation, 1, 42-53. doi: 10.4236/ojmsi.2013.14008.