Inline.
-- Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Feb 23, 2016 at 2:42 AM, <james.fo...@diamond.ac.uk> wrote:
> Dear R community,
> this is probably a well-known topic to some of you, but I am not well into it
> and would like some clarifications or even jus some suggestions.
>
> I have a quadratic scalar field:
>
> F(x,y)=K*exp(-(a*x^2+b*y^2+c*x*y))
>
> I also have a random set of positive x,y values and related F(x,y) values.
> It seems reasonable to estimate the parameters K, a, b, c with a linear
> regression,
> using the log of both sides of the equation.
Not necessarily. It depends on how the error term enters the model.
I suggest you consult with a local statistician or post as Peter
suggested. You appear to be out of your statistical depth here.
>
> What worries me, though, is the interaction term, c*x*y.
>
> Are there well-known issues on the application of linear regression to cases
> like this one?
>
> Thanks in advance for your answers.
>
> James
>
> --
> This e-mail and any attachments may contain confidenti...{{dropped:8}}
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