[R] nls plinear formula

From: gutierrez.m05 <gutierrez.m05_at_gmail.com>
Date: Tue, 29 Apr 2008 08:27:32 +0200


I want to fit a nonlinear model of the form: Y=A+B*X1+C*X2+log(X3/(X3+D))
I think that the best way is to use the plinear algorithm, but I don't know how to specify the formula in the nls function. I've tried:
Y~cbind(rep(1,times=length(Y)),X1,X2,log(X3/(X3+D))) But this fits the model:
Y=A+B*X1+C*X2+D1*log(X3/(X3+D))
How can I specify the formula correctly? Thanks,
M



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