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Dave,
I probably cannot offer much here. While I understood that you were
asking about detecting a reversal of direction of an indicator, it
seemed to me that working with an indicator in this fashion would be
almost synonomous with trying to detect significant market or equity
price trend changes.
What indicator(s) are you trying to analyze and what would be the
ultimate end or purpose of the study?
phsst
--- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx> wrote:
> hi Phsst, think we're talking about two different things.
>
> I did ask a while back about distinguishing trending and non-trending
> markets, and did investigate ADX/DMI. (ADX/DMI seems more short term
than I
> had in mind. I was thinking about these months-long sideways
markets, how to
> numerically tell them apart from more strongly trending ones, and what
> strategies you might take to respond.)
>
> but this is a separate question: given an indicator, any indicator,
how can
> you efficiently detect when it has reversed direction by a spec'd
amount?
> any ideas?
>
> dave
>
>
> > Just a possibility...
> >
> > Take a look at ADX, +DI & -DI.
> >
> > ADX tells you if a trend is in place.
> >
> > Crossover of +DI / -DI might be a decent indicator of a change in
trend.
> >
> > I have not done any testing on this but you might want spend a little
> > time looking at it.
> >
> > phsst
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
wrote:
> > > um, unless I'm reading this wrong, it's pretty clear, as I
thought: Zig
> > > "cheats", in a way, so it can't ever be used in trading systems and
> > won't
> > > backtest realistically. am I missing something?
> > >
> > > part of me feels like I must be, or these functions wouldn't be very
> > useful
> > > in real life. jayson's post made it clearer to me how it responds,
> > but for
> > > backtesting, there doesn't seem to be any way to keep it from
> > knowing what
> > > it already knows about bars that haven't happened yet. or maybe I'm
> > missing
> > > another something.
> > >
> > >
> > > back to my original question about detecting reversals. I want
to find
> > > places where an indicator has dropped at least a specified amount
> > from its
> > > high since the last switch, or risen that amount from its low since
> > the last
> > > switch. the key thing here is finding the high since the last
rise off a
> > > low, and the low since the last drop from a high.
> > >
> > > is Zig or one of its relatives the best or only way to do this,
short of
> > > stepping through the indicator array a bar at a time?
> > >
> > > Dave Merrill
> > >
> > >
> > > > Definitive answer on Zig is included in the User's Guide, AFL
> > reference:
> > > > http://www.amibroker.com/guide/afl/afl_view.php?name=ZIG
> > > >
> > > > Caveat: this function is based on Zig-Zag indicator and may look
> > > > into the future - this means that you can get **unrealistic
> > > > results** when back testing trading system using this indicator.
> > > > This function is provided rather for pattern and trend recognition
> > > > formulas
> > > >
> > > > Best regards,
> > > > Tomasz Janeczko
> > > > amibroker.com
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