The reason that the line doesn't appear to fit is that by default it appears to be fitting all of the data in the array to the polynomial.
I have tried different order equations and found that 2nd order (quadratic) works the best for me. The number of bars for the fit I set to between 20 and 50 - which it appears you can do with this code. A few things you can do is 1. Take the first derivative of the resulting equation to produce the slope at the last data point, and use the normalized slope (%-per-day) as a ranking indicator. 2. Check the slope at the beginning, middle, and end of the array to search for cup-and-handle patterns. Actually you use a long one (50-100 bars shifted back 20 bars) for the cup and a short one (10-20 bars not shifted) for the handle. then create a search based on the shape(slopes) of the resulting parabolas. 3. Create an indicator that consists of the last value of the slope of a n-bar set of going back to the start of the data. This produces a nice smooth oscillator indicating tops & bottoms in price. Ed Hoopes --- In [email protected], "d_hanegan" <[EMAIL PROTECTED]> 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/
