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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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