stannard: Stannard growth model

In growthmodels: Nonlinear Growth Models

Stannard growth model

Description

Computes the Stannard growth model

y(t) = \alpha \left[ 1 + exp(-(\beta + k t)/m) \right]^{-m}

Usage

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

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

Arguments

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

Author(s)

Daniel Rodriguez

References

A. Khamiz, Z. Ismail, and A. T. Muhammad, "Nonlinear growth models for modeling oil palm yield growth," Journal of Mathematics and Statistics, vol. 1, no. 3, p. 225, 2005.

Examples

growth <- stannard(0:10, 1, .2, .1, .5)

# Calculate inverse function
time <- stannard.inverse(growth, 1, .2, .1, .5)

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