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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@xxx> 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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