richard: Richard growth model

In growthmodels: Nonlinear Growth Models

Richard growth model

Description

Computes the Richard growth model and its inverse

y(t) = \frac{\alpha}{(1 + \beta exp(-k t))^{(1/m)}}

Usage

richard(t, alpha, beta, k, m)

richard.inverse(x, alpha, beta, k, m)

Arguments

t	time
alpha	upper asymptote
beta	growth range
k	growth rate
m	slope of growth
x	size

Author(s)

Daniel Rodriguez

References

D. Fekedulegn, M. Mac Siurtain, and J. Colbert, "Parameter estimation of nonlinear growth models in forestry," Silva Fennica, vol. 33, no. 4, pp. 327-336, 1999.

Examples

growth <- richard(0:10, 10, 0.5, 0.3, 0.5)

time <- richard.inverse(growth, 10, 0.5, 0.3, 0.5)

growthmodels documentation built on May 31, 2023, 8:14 p.m.