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The Morgan-Mercer-Flodin (MMF) growth equation is described by the equation:
where l = length, (or weight, height, size) and t = time.
The four parameters are:
β, the size at t=0;
δ, a parameter that controls the point of inflection.
The point of inflection is located at:
The following graphs show example plots of the MMF growth curves for different values of δ (delta).