Weibull 
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The Weibull growth model is described by the equation:
where l = length, (or weight, height, size) and t = time.
The four parameters are:
β, is the lower asymptote; δ, is a parameter that controls the xordinate for the point of inflection.
The point of inflection on the x axis lies at:
If δ = 1 the Weibull is a simple exponential growth curve.
The following graphs show example plots of the Weibull growth curve for different values of δ (delta).
