Description Usage Arguments Author(s) References Examples
Computes the Gompertz growth model and its inverse
y(t) = α * exp(-β * exp(-k^t))
1 2 3 | gompertz(t, alpha, beta, k)
gompertz.inverse(x, alpha, beta, k)
|
t |
time |
alpha |
upper asymptote |
beta |
growth displacement |
k |
growth rate |
x |
size |
Daniel Rodriguez
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.
1 2 3 4 | growth <- gompertz(0:10, 10, 0.5, 0.3)
# Calculate inverse function
time <- gompertz.inverse(growth, 10, 0.5, 0.3)
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