chapmanRichards: Chapman-Richards growth model

Description Usage Arguments References Examples

View source: R/chapmanRichards.R

Description

Computes the Chapman-Richards growth model and its inverse

y(t) = α * (1 - β * exp(-k * t)^{1/(1-m)})

Usage

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

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

Arguments

t

time

x

size

alpha

upper asymptote

beta

growth range

k

growth rate

m

slope of growth

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

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growth <- chapmanRichards(0:10, 10, 0.5, 0.3, 0.5)
# Calculate inverse function
time <- chapmanRichards.inverse(growth, 10, 0.5, 0.3, 0.5)

Example output



growthmodels documentation built on May 2, 2019, 1:29 p.m.