[R] Multiple linear regression

[Jim Lindsey]

> 
> Dear R-users,
> I've a question regardiing multiple linear regression.
> Is it possible to regress a function of the type
> y=b0+b1*x1+b2*x2
> constraining the partial derivatives dy/dx1 and dy/dx2 to be greater
> than 0 ???

One easy possibility is to fit it as a nonlinear regression:
y=b0+exp(b1)*x1+exp(b2)*x2
  Jim

> 
> Thank you very much for any possible suggestion.
> Best regards
> Marco
> 
> 
> --
> Marco Pagani - PhD Student
> Dipartimento di Scienze della Terra - Sezione Geofisica
> Universita' degli Studi di Milano
> c/o
> CSGAQ - CNR
> via Bassini, 15 - I-20133 Milano - Italia
> tel: +39-02-23699455
> fax: +39-02-26680987 / +39-02-2362946
> 
> 
> 
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