R help - Dec 2009 - coefficients of each local polynomial from locfit

Hi list,

This was asked a couple of years ago but I can't find a resolution.  Is
there any way to get the coefficients from one of the local polynomial fits
in locfit.  I realize that locfit only constructs polynomials at a handful
of intelligently selected points and uses interpolation to predict any other
points.  I would like to know the terms of the polynomials at these points.
It seems likely that they are stored in [locfit object]$eva$coef but I'm
having trouble making sense of that list.  That list is the second argument
passed into the C function spreplot called from preplot.locfit.raw if that
helps.

Thanks,
David

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On Dec 8, 2009, at 12:33 PM, David Grabiner wrote:
> Hi list,
>
> This was asked a couple of years ago but I can't find a resolution.   
> Is
> there any way to get the coefficients from one of the local  
> polynomial fits
> in locfit.  I realize that locfit only constructs polynomials at a  
> handful
> of intelligently selected points and uses interpolation to predict  
> any other
> points.
That is not my understanding of what locfit does. I could be wrong and  
am interested in correcting my misunderstanding if that is the case. I  
thought a polynomial was fit at _each_ point.  What pages in Loader's  
book should I be reading.

>  I would like to know the terms of the polynomials at these points.
> It seems likely that they are stored in [locfit object]$eva$coef but  
> I'm
> having trouble making sense of that list.  That list is the second  
> argument
> passed into the C function spreplot called from preplot.locfit.raw  
> if that
> helps.
>
> Thanks,
> David
--

David Winsemius, MD
Heritage Laboratories
West Hartford, CT