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Re: [amibroker] Re: Built-in DEMA questions



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Hello,

For complete C++ source look at the end of the message:
http://groups.yahoo.com/group/amibroker/message/38856

Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message ----- 
From: "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Sunday, April 27, 2003 8:12 PM
Subject: [amibroker] Re: Built-in DEMA questions


> Tomasz,
> Is it possible to give me this reference for full source code of DEMA.
> TIA
> Dimitris Tsokakis
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx> 
> wrote:
> > Hello,
> > 
> > I have posted full source code of DEMA.
> > It includes all inner workings so please refer there.
> > 
> > Best regards,
> > Tomasz Janeczko
> > amibroker.com
> >   ----- Original Message ----- 
> >   From: Dimitris Tsokakis 
> >   To: amibroker@xxxxxxxxxxxxxxx 
> >   Sent: Saturday, April 26, 2003 2:14 PM
> >   Subject: [amibroker] Built-in DEMA questions
> > 
> > 
> >   Some things should be explained about DEMA and its expected 
> behavior:
> >   Let us use a fast DEMA [green line, period=10] and a slow one 
> [yellow line, period=10]
> >   A third, variable period DEMA [the black thicker line], uses the 
> fast period and, suddenly, 200 bars ago, changes to slow.
> >   The result will immediately leave the green curve, but 
> asymptotically touch the yellow one. 
> >   It will not be a real 50-bar DEMA, even after 200 bars.
> >   Note that all this 200-bar period the variable DEMA stays higher 
> than the slow one. [above gif]
> >   To answer my [obvious] questions, I search the available 
> reference [instead of leaving my imagination to fly around].
> >   The explanatory note via 
> >   http://groups.yahoo.com/group/amibroker/message/38844 
> >   sends me to 
> >   http://www.amibroker.com/guide/afl/afl_view.php?name=DEMA
> >   where I read the comment
> > 
> >   DEMA internally is implemented via EMA:
> >   Len=10;
> >   Graph0= 2 * EMA( C, len ) - EMA( EMA( C, len ), Len );
> >   // for comparison only
> >   Graph1=DEMA(C,Len);
> > 
> >   Some more explanations should be added because:
> >   a. The built-in DEMA begins from the first bar and the analytic 
> EMA equivalent begins 400 bars later. 
> >   How the built-in DEMA is defined for the first 400 bars ? 
> >   [The question holds for IB and AA, see the simple exploration
> > 
> >   Len=200;
> >   G0= 2 * EMA( C, len ) - EMA( EMA( C, len ), Len );
> >   G1=DEMA(C,Len);
> >   Filter=1;
> >   AddColumn(G0,"ANALYTIC DEMA");
> >   AddColumn(G1,"DEMA");
> >   AddColumn(Cum(1),"BARS",1.0);
> > 
> >   and the att. gif]
> > 
> >   b. Should we expect a 2*Len delayed response when variable 
> periods is used ?
> >   c. My CSCO history is 831 bars [Jan3, 2000 till now]. The 
> >   Graph0= 2 * EMA( C, len ) - EMA( EMA( C, len ), Len );
> >   begins on Aug2, 2001.
> >   c1.Can we speak for a proper function use back in the critical 
> Oct2, 2001 CSCO low?
> >   The built-in DEMA is 11.53 and the EMA equivalent is 9.08 !!!!!
> >   c2.After how many bars the two formulas are less than 1% 
> diverging ?
> > 
> > 
> >   Built-in DEMA is, IMO, one of the most powerful AFL tools, its 
> use in trading systems design gives excellent results
> >   and this is accurately translated to interesting profits. 
> >   To avoid any misunderstanding [the recent winds are S to SW, not 
> that healthy...]
> >   my questions do not search for built-in functions secrets, it 
> would be useless to me. 
> >   Just a better explanation to understand
> >   the expected DEMA behavior would encourage users/traders to step 
> into this great function. 
> >   5-10 lines would be more than enough, no need for 1000+ pages.
> >   Thank you in advance for any reply.
> >   Dimitris Tsokakis
> > 
> >         Yahoo! Groups Sponsor 
> > 
> >              
> >        
> >        
> > 
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