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Fred:
Thanks for your posts and all of the information concerning the
Polynomial Trendlines. When I run the code, I pretty much just get
a straight green line; it does not fit my data. I thought I had
read all of the posts. Am I missing something?
Thanks.
Dan
--- In amibroker@xxxxxxxxxxxxxxx, "Fred" <ftonetti@xxx> wrote:
>
> Be AWARE ... that was a hand picked image ... if you play with
> PolyFit you will see that sometimes data fits the extrapolations,
> sometimes it doesn't.
>
> The higher the order, the flakier the extrapolations are likely to
> become ...
>
> So ... Remember what it is ... a generator of an equation in the
form
>
> Y = a + bx + cx^2 + ... + nx^(n-1)
>
> Where the coeeficients were pick to fit the data.
>
> IMHO what PolyFit is, epecially with very high orders is a very
good
> detrender of IN SAMPLE data, nothing more, nothing less ... That
in
> and of itself is a useful tool ... Gaussian Elimination can also
be
> the basis for some other things that are pretty decent when the
order
> is kept fairly low i.e. 3 or 4 ...
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Ara Kaloustian" <ara1@> wrote:
> >
> > Polynomial TrendlinesFred,
> >
> > There have been a lot of posting on this subject. Your one
image
> however is a very powerful message of its potential.
> >
> > Now I have to go back and review all the post ... hoping to find
a
> good reference to study.
> >
> > Anyone using it succesfully now?
> >
> > Ara
> > ----- Original Message -----
> > From: Fred Tonetti
> > To: amibroker@xxxxxxxxxxxxxxx
> > Sent: Tuesday, October 03, 2006 3:32 PM
> > Subject: [amibroker] RE: Polynomial Trendlines
> >
> >
> > Oops .
> >
> >
> >
> > Meant to include this visual .
> >
> >
> >
> > Green is calculated . White is extrapolated .
> >
> >
> >
> >
> >
> >
> >
> > -----------------------------------------------------------------
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