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Ron,
It would be better to understand how zig operates.
[The same with other T/A functions : You should accept the definition
and then use it if you like it. A 3-bar MA is the average of the last
3 Close values. It is the definition. It doesn t make sense to
ask "why not another 4th bar, it was Tuesday and I want to include
it !
You may include a 4th day, but you will not have a 3-bar MA, you will
have something else.]
So, zig(H,10) will give a peak at point A when the prices will fall
more than 10% fro point A price. This is by definition and nobody
cheats the user. This 10% drop may occur 3 or 10 or 50 bars after
point A.
If it happens, then an angle will appear at point A, no matter if it
is 3 or 10 or 50 bars back.
This is the way zig operates. The last leg is variable and it is
stabilised when the 10% condition is fulfilled.
Now, when you study the past history of QQQ, you see a peak on point
A. You should understand [and accept]
that this angle was placed at A some [or many] bars later.
Zig, like the other functions, can not work the way we like. Their
horizon is limited by definitions.
This is why I wrote it is wrong to use *any* zig/peal/trough function
in buy/sell orders. It is as absurd as to decide on Monday to place a
buy order for the previous Wednesday. It is impossible and any
backtesting baring this idea will be simply wrong and inapplicable.
If you dont like the nature of zig function, the solution is simple :
Do not use it.
Just accept a function as is, it will never become more friendly,
even if I apply my charm.
Dimitris Tsokakis
PS As for the Santa Clause, he told me last year that he does not
exist [and never was]. His statement was cool, I had no reason to
doubt and I believed his word. In one way or another, he knows better
the existence theory...
--- In amibroker@xxxxxxxxxxxxxxx, "mrdavis9" <mrdavis9@xxxx> wrote:
> Is there anyway to do visual historical backtesting of zig in a way
such that the zig code knows nothing at all about future events.
> I obviously do not know how AFL works with zig. When I run a scan
on all stocks, n last days, n=1, then it is only possible for zig to
tell me what he knows based on the available historical data plus the
EOD data that I just downloaded after the markets closed on the very
day that I am running the scan. Now later, when I scroll the screen
back, various past dates will be showing on the extreme right side of
the chart, along with various indicator values that were computed
using the historical data stored on my hard drive. Apparently,
these historical zig angles that I am seeing when I look at day 100
of the year are not the same zig angles that would have been computed
on day 100 of the year if a scan had been run on day 100 of the
year. Why not? Isn't AFL looking at only the data that was
available up to and including day 100 of the year. In other words,
if I scroll back to day 1 of the year, and then scroll foreword one
day at time, why is this not the very same accumulation of data that
was stored on my hard drive when I downloaded the EOD data when I got
home from work on day 100. Why does zig want to cheat and look at
the the data from day 100+ as I scroll foreword from day 1 of the
year. If zig is cheating under these conditions, then what is to
stop EMA and RSI from also cheating. What you now appear to be a
implying about zig reminds me of how I felt when I was informed that
Santa Clause does not exist. I have never forgiven my older brother
for that revelation. My nontech mind can't fathom why zig would
tell a different story when told to go back and look at the exact
same data a second time. All revelations in layman's language will
be appreciated. Ron D
>
>
>
>
>
> ----- Original Message -----
> From: DIMITRIS TSOKAKIS
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Tuesday, August 05, 2003 5:33 AM
> Subject: [amibroker] Re: Revised MACDxPriceOSC (With Zig Filter)
>
>
> Michael,
> In your Buy/Sell conditions you use UTrend and DTrend.
> This fact makes your rules unrealistic.
> UTrend and DTrend are zig related conditions and their truth is
known
> some bars after the historical occurrence you see in the past bars.
> Dimitris Tsokakis
> --- In amibroker@xxxxxxxxxxxxxxx, "Michael.S.G." <OzFalcon@xxxx>
> wrote:
> > Working with Dennis's AFL previously posted using MACD x
PriceOSC,
> is a revision that also checks for current trend via zigzag
funtion.
>
> Zig is Adjustable Via Parameters Dialog (CTRL-R). And Signals
> likewise change while being Adjusted.
> Feedback to the status of Zig is also given by Coloring of the
> barstyle chart.
>
> //MACD POSC cross, By Dennis aka theoldchartreader@xxxx
> //With Zig Confirmaion Filter by OzFalcon@xxxx <MSG>.
>
> AdjZ = Param("Zig",10,0,15.0,.1);
> ZAC = Zig( Close, AdjZ );
>
> UTrend = ZAC > Ref(ZAC, -1);
> DTrend = ZAC < Ref(ZAC, -1);
>
> t1 = OscP( 3, 6 );
> Cond1a= Cross (t1,MACD());
> Cond1b= MACD()>-1 AND MACD()<0;
> Cond1= Cond1a AND Cond1b;
> Cond2 = MACD()>Signal()-.5;
> Buy = Cond1 AND Cond2 AND UTrend;
> Sell=Cross(0,t1) AND DTrend;
>
> Color = IIf(O > C, colorBlack, colorRed);
> Plot( Close, "Price", color, styleCandle );
> PlotForeign( GetBaseIndex(), GetBaseIndex(), colorLightGrey );
>
> PlotShapes( shapeDownArrow * Sell, colorRed );
> PlotShapes( shapeUpArrow * Buy, colorGreen );
>
> ZColor = IIf(UTrend, colorAqua, colorYellow);
> Plot( ZAC, "Zig", ZColor, 3);
>
> /// Iterpretation
> "Look at weekly chart first,if it is bullish,";
> "then look at daily chart for a entry point";
> "Use CTRL-R To adjust Zig Detail";
>
>
>
>
>
> Send BUG REPORTS to bugs@xxxx
> Send SUGGESTIONS to suggest@xxxx
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