Now if someone can take this method and/or AFL or at least provide a how to that takes us into Trigometric curve fitting and extrapolation i.e. the solution of simultaneous equations in the generalized format of a spectral model i.e. ...
S ~ (a1 cos w1t + b1 sin w1t) + ... + (Am cos wm + bm sin wmt) Then we might have something fairly useful ... I suspect Gaussian Elimiation can be used for this as well, but I don't have the skill level to calculate the necessary matrix entries to get it down ... Any mathematicians out there ? --- In [email protected], "Fred" <[EMAIL PROTECTED]> wrote: > > When stretch over enough data almost any order will become a pseudo > straight line ... > > By their nature a first order IS a straight line, 2nd U shape, 3rd > order sine wave etc ... > > Try highlighting a SMALLER segment of data by using the beginning and > ending range markers ... > > > --- In [email protected], "d_hanegan" <dhanegan@> wrote: > > > > 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 [email protected], "Fred" <ftonetti@> 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 [email protected], "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: [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/
