Hi

This might be a simple question, but I can't find an answer:

I have fitted a logistic model using

f <- nls( cove ~ SSlogis(year, Asym, xmid, scal), data = dat, model=TRUE)

and I get the following coefficients:

coef(f)
     Asym       xmid       scal
45248.8469  2008.2121     8.4025

Now, the "ecological" logistic growth has usually the coefficients
"Capacity" (K) and "growth rate" r (see e.g.
http://en.wikipedia.org/wiki/Logistic_function#In_ecology:_modeling_population_growth
).

Now it is obvious, (at least I hope ...) that Asym is equal to K.

But how can I get r?

Thanks,

Rainer


-- 
Rainer M. Krug, Centre of Excellence for Invasion Biology, Stellenbosch
University, South Africa

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