Re: [R] constructing a self-starting non-linear model

2007-10-07 Thread Peter Dalgaard 
Irene Mantzouni wrote:
> Dear all,
>  
> I am trying to define a selfStart function for a non-linear model, which is a 
> log-transformed SSmicmen model with multiplicative errors and so it is 
> required to make them additive:
>  
> log(y)=log(a)+log(x)-log(1+x/b)
>  
>  
> Any ideas about how to use the "peeling" method to derive the "initial" 
> argument and get the initial values?
>  
>   
Does it not work just to reuse the SSmicmen initializer?


-- 
   O__   Peter Dalgaard Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark  Ph:  (+45) 35327918
~~ - ([EMAIL PROTECTED])  FAX: (+45) 35327907

__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

[R] constructing a self-starting non-linear model

2007-10-06 Thread Irene Mantzouni 
Dear all,
 
I am trying to define a selfStart function for a non-linear model, which is a 
log-transformed SSmicmen model with multiplicative errors and so it is required 
to make them additive:
 
log(y)=log(a)+log(x)-log(1+x/b)
 
 
Any ideas about how to use the "peeling" method to derive the "initial" 
argument and get the initial values?
 
Thank you for being always there!:)
 
Irene

__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.