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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 present
such 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 everything in this life...)]
Best Regards
Dimitris 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 the last 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
> amibroker.com
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