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 [email protected], "Ara Kaloustian" <[EMAIL PROTECTED]> 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: [email protected] > 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 . > > > > > > > > -------------------------------------------------------------------- ---------- > I am using the free version of SPAMfighter for private users. > It has removed 8588 spam emails to date. > Paying users do not have this message in their emails. > Try SPAMfighter for free now! > Please note that this group is for discussion between users only. To get support from AmiBroker please send an e-mail directly to SUPPORT {at} amibroker.com For other support material please check also: http://www.amibroker.com/support.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/amibroker/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/amibroker/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
