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[amibroker] Re: Another, less important, question



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Fred,
thank you for the reply.
Yes I read your messages, they are interesting, but, it is not a 
matter of my opinion or your opinion. What is written in AFL function 
reference is the subject. 
As Tomasz wrote, the DEMA and the EMA-equivalent match after the 
initial period. I do not see this in my gifs posted at
http://groups.yahoo.com/group/amibroker/message/38859
Take a look.
DT
 
--- In amibroker@xxxxxxxxxxxxxxx, "Fred" <fctonetti@xxxx> wrote:
> Dimitris,
> 
> I tried to explain this the other day ... maybe you didn't see my 
> post or have my email on ignore but I'll take another shot in case 
> you are listening ...
> 
> EMA is or should be equivalent to AMA when one is using a constant 
> for the length but for whatever reason the way that EMA is 
> implemented it takes a bunch of bars to catch up to AMA or vice 
versa 
> depending on your point of view.  In a 10 bar EMA it takes 43 bars 
> before EMA and AMA have the same value following which they both 
have 
> the same values.
> 
> DEMA appears to be using an adaptation of AMA for it's calculations 
> as opposed to EMA as it produces plotable points right away.  Here 
> again if one compares DEMA with ones own calculation for DEMA using 
> AMA and EMA the AMA version is identical to the imbedded DEMA and 
the 
> EMA version takes awhile to be on the same track.
> 
> Best Regards, Fred
> 
> --- In amibroker@xxxxxxxxxxxxxxx, "DIMITRIS TSOKAKIS" 
<TSOKAKIS@xxxx> 
> wrote:
> > 
> > > 
> > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" 
> > <amibroker@xxxx> 
> > 
> > > > DEMA is perfectly OK. The same with TEMA, WMA, etc.
> > 
> > What do you mean "perfectly OK".
> > After how many bars the built-in DEMA matches its EMA-equivalent 
> > described in your DEMA comment in AFL function reference.
> > I have already posted #38859 with full explanatory codes and gifs 
> > showing the divergence of DEMA and EMA-equivalent.
> > Did you read this message ?
> > Would you apply equally DEMA or EMA-equivalent in a trading 
system?
> > Would you equally rely upon any of these two "equivalent" 
formulas ?
> > Would you trade your money based on DEMA or, equally, on EMA-
> > equivalent?
> > This would be "perfectly OK"
> > If for a certain bar DEMA gives you 9 and the EMA-equivalent 
gives 
> > 11, then it is not perfectly OK, I could say it is quite far from 
> any 
> > reliability idea.
> > I did not understand your reply, except if you didnīt read #38859
> > Dimitris Tsokakis 
> > > >


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