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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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