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DT, thanks a lot for a great expose of
zig. The more that I found out about zig, the less I liked him.
Actually, I never did like him, I just played with him once for a few
minutes. These recent posts about him prompted me to glance at
him again for a few minutes. Ron D
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
DIMITRIS
TSOKAKIS
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, August 06, 2003 6:12
PM
Subject: [amibroker] Re: Zig is
decieving?
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 TsokakisPS 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 <A
href="">amibroker@xxxxxxxxxxxxxxx,
"mrdavis9" <mrdavis9@x...>
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: <A
href="">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 <A
href="">amibroker@xxxxxxxxxxxxxxx,
"Michael.S.G." <OzFalcon@x...> >
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 <A
href="">theoldchartreader@x...> //With
Zig Confirmaion Filter by OzFalcon@x...
<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 <A
href="">bugs@x...> Send SUGGESTIONS to <A
href="">suggest@x...>
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