Generalised Logistic Curve

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

See also

*Logistic function

 

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