ith respect to delta is always 0 and so
> the gradient is singular.
> Why do you need delta at all?
>
> --- On Mon, 27/7/09, Berlinerfee wrote:
>
>
>> From: Berlinerfee
>> Subject: [R] Non-Linear Regression with two Predictors
>> To: r-h...@stat.math.ethz
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
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