[R] coefficients of each local polynomial from locfit

[David Winsemius]

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