[R] help for nls

BARNERIAS Cyrille CBARNERIAS at caen.ifn.fr
Mon Nov 15 14:42:10 CET 2004


I am beginning with R and I would like to test a non linear model. But I do
not find exactly wath I am looking for in nls packages (or I do not know
where to search).
I would like to try a model like this : y=b * x exp(n)/(a exp(n) + x exp
a = a0 + a1z
b= b0 + b1z
x and z are variables
y the variable that I am trying to modelise
a0, a1, b0 and b1 are parameters to determine.
I am wondering if I can use nls and if so how do I have to write my command
Thanks in advance for your help.

Cyrille Barnérias
Adjoint au chef d'échelon interrégional de Caen
Inventaire forestier national
73 rue Marie Curie
14 200 Hérouville Saint-Clair
Tel :

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