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Comments interspersed
----- Original Message -----
<BLOCKQUOTE
>
<DIV
>From:
DIMITRIS
TSOKAKIS
To: <A title=amibroker@xxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, August 08, 2001 8:13
AM
Subject: [amibroker] Re:New
indicator
And another one, copied exactly from the source:"To calculate
the detrended price oscillator an x-period moving average is centered.
This is done by shifting the moving average back [(x/2) + 1] period.
This centered moving average is then subtracted from the close.
Because it is set up as an oscillator, it will cross above and below
zero. The last [(x/2) + 1] period will have no value. This is
because the detrended price oscillator is shifted back [(x/2) + 1]
period."Could any user accept this??"The last [(x/2) + 1] period
will have no value"i.e. for a period of 20 days, you will not have
indicator value for the last 11 days.Then, what do you have??A
good report of what happened 11 days ago ??This is not serious.If
anyone in this revolutionary mail-list attempted to presentsuch an
indicator, with no value for the last 11 days, it is not difficult to
predict the reactions [In between, I prefer this software
makers.At least, they are honest and inform the user that he "will have no
value".And explain the reason.(They do not explain the purpose and
the application of this indicator.But, we can not have everythingin
this life...)]
<BLOCKQUOTE
>
Detrending is a cycle finding
methodology. Its purpose is to identify short cycles thatare
masked by moving averages. Detrending reverses the process by
eliminating cycles longer than the average. The lack of oscillator
data for the last XX days does not detract from its
function.Best RegardsDimitris Tsokakis
--- In amibroker@xxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:> Hi,> > >Because, whithout data for tomorrow,
the program gives for> >ref(close,1) the available today´s
price.> >(In my opinion, it should indicate an {empty} value,
because> >ref(close,+1) exists for all previous days except thelast
one)> >I do not know how it is designed, I know how it
works.]> > Yes it gives today's price for the last bar as we
don't know the future yet :-)> The reason why it doesn't return
{empty} is that some of the other> functions may be confused if they
see {empty} at the end of the array> (normally {empty} values
appear only at the beginning and all AFL functions> are aware of
this fact)> > Also: I agree with Dimitris that writing trading
systems using Ref with positive> offsets (looking into the future)
would give results that could not be > reproduced in real life.
(unless you have time-machine :-)))> > > Best
regards,> Tomasz Janeczko>
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