Bert, Ryan, Alain,

You suggestions are very helpful. Thank you. I learned a lot from the
discussion.

Cindy

On Tue, Jul 28, 2009 at 8:53 AM, Ryan <rhafen@purdue.edu> wrote:

> Bert Gunter <gunter.berton <at> gene.com> writes:
>
> >
> >
> > Actually, loess is much more than an "interpolant".  I wouldn't
> > even call it that.  It is a local regression  technique that comes
> > with all the equipment you get in classical regression.  But it
> > is meant for normal-like errors, which is not what you have.
> >
>
>
> Bert - when I hear "interpolate", I think of connecting the
> data points, like using something like divided differences
> or hermite interpolation, so I thought that's what you
> meant.  Sorry for the misunderstanding.
>
> True that loess was designed to be robust, but when I
> said it is meant for normal-like errors, I was referring
> to loess with statistical procedures analagous to the
> classical regression setting, such as confidence intervals,
> anova, etc. (see "Locally Weighted Regression: An
> Approach to Regression Analysis by Local Fitting", 1988).
>
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