is always 0 and so
the gradient is singular.
Why do you need delta at all?
--- On Mon, 27/7/09, Berlinerfee berliner...@yahoo.de wrote:
From: Berlinerfee berliner...@yahoo.de
Subject: [R] Non-Linear Regression with two Predictors
To: r-h...@stat.math.ethz.ch
Received: Monday, 27 July, 2009
Hello there,
I am using nls the first time for a non-linear regression with a
logistic growth function:
startparam - c(alpha=3e+07,beta=4000,gamma=2)
fit - nls(dataset$V2~(( alpha / ( 1 + exp( beta - gamma * dataset$V1 )
) ) ),data=dataset,start=startparam)
Everything works fine and i get
2 matches
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