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Generalised logistic curve
The generalised logistic (or Richard's) curve is a widely used and flexible function for growth modelling.
<math>Y = A + { C \over (1 + T e^{-B (x - M)}) ^ {1 / T} }</math>
where Y=weight, height, size etc; X = time.
It has five parameters:
- A
- the lower asymptote;
- C
- the upper asymptote;
- M
- the time of maximum growth;
- B
- the growth rate;
- T
- near which asymptote maximum growth occurs.
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