Morgan-Mercer-Flodin

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;
L∞, the upper asymptote;
k, the growth rate and

δ, a parameter that controls the point of inflection.

The point of inflection is located at:

and

The following graphs show example plots of the MMF growth curves for different values of δ (delta).