On 2012-08-14 00:09, Christof Kluß wrote:
Hi
there are some predefined self-start functions, like SSmicmen, SSbiexp,
SSasymp, SSasympOff, SSasympOrig, SSgompertz, SSflp, SSlogis, SSweibull,
Quadratic, Qubic, SSexp (nlrwr)
Btw, do you know graphic examples for this functions?
The SSexpDecay (exponential decay) for y = (y0 - plateau)*exp(-k*x) +
plateau from
http://stats.stackexchange.com/questions/17126/how-can-i-make-my-r-nls-model-more-stable
works fine, too.
But now I search a self-starter for y = a + b * c^x
Do you know a package that implement such self-starter or is there a
easy way to do it myself?
Can't you just reparameterize with c^x = exp(x * log(c)) ?
Peter Ehlers
thx
Christof
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