Stannard growth model
Computes the Stannard growth model
y(t) = α *( 1 + exp(-(beta + k * t)/m))^(-m)
stannard(t, alpha, beta, k, m) stannard.inverse(x, alpha, beta, k, m)
t |
time |
x |
size |
alpha |
upper asymptote |
beta |
growth displacement |
k |
growth rate |
m |
slope of growth |
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.
growth <- stannard(0:10, 1, .2, .1, .5) # Calculate inverse function time <- stannard.inverse(growth, 1, .2, .1, .5)
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