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thank
you I got that one. What I really want to do:
once
my portfolio has dropped below a predefined percentage, say 5%, I would like to
sell the stock with the most drawdown, not sure how that can be
done?
For
starter
<SPAN
class=633555202-27012004>---------------
<SPAN
class=633555202-27012004>buy=cross(macd(),signal());
<SPAN
class=633555202-27012004>sell=cross(signal(),macd());
<SPAN
class=633555202-27012004>buy=exrem(buy,sell);
sell=exrem(sell,buy);
<SPAN
class=633555202-27012004>positionscore=random();
<SPAN
class=633555202-27012004>eq=Foreign<FONT
color=#000000 size=2>("~~~EQUITY"<FONT
color=#000000 size=2>, "C"<FONT
size=2>);dr=(<FONT
face="Times New Roman">eq - <FONT color=#0000ff
size=2>Highest<FONT color=#000000
size=2>(eq))/highest(eq);
sell=iif(dr<-0.05,"choose
the stock with the highest drawdown",sell);
<SPAN
class=633555202-27012004>-------------------------------------------
Firstly, Can I use the ~~equity
composite dynamically as it is written and rewritten, (I cant see why i cant i
am just reading it).
Secondly, is it possilbe the
find out which stock in the portfolio has the highest drawdown at the
time?
Thanks for your
help.
/Paul.
<FONT
face=Tahoma size=2>-----Original Message-----From: Tomasz Janeczko
[mailto:amibroker@xxxxxx] Sent: Tuesday, 27 January 2004 2:17
AMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re: [amibroker]
Re: Backtest using equity curve
Hello,
One correction. Portfolio equity is definitelly NOT the sum
of individual backtest equities in general case.
This is so because in portfolio mode some trades can be
dropped due to insufficient funds.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Herman
vandenBergen
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Monday, January 26, 2004 2:16
PM
Subject: RE: [amibroker] Re: Backtest
using equity curve
<FONT face=Arial color=#0000ff
size=2>A single Backtest of a single stock's equity is
Equity(0) or Equity(1), see Help for more on the 0 and 1
arguments.
<FONT face=Arial color=#0000ff
size=2>If you Backtest a series of stocks the equity() will take on a
different value for each new stock that is processed. These equities can be
summed using an AddToComposite(). This is more or less what happens when you
use the portfolio tester and you can access the final portfolio equities
using Foreign(), like with this code (originating from TJ I think) that
shows how to retrieve the Portfolio Equity. The "~~~EQUITY" composite is
created by the portfolio backtest:
// TJ's Equity
Plotseq = Foreign<FONT
size=2>("~~~EQUITY",
"C");cash =
Foreign(<FONT
color=#ff00ff size=2>"~~~EQUITY", <FONT
color=#ff00ff size=2>"L");dr = eq - <FONT
color=#0000ff size=2>Highest(eq);bslh = <FONT
color=#0000ff size=2>HighestBars<FONT
size=2>(eq);GraphZOrder=1<FONT
size=2>;Plot(eq,
"Portfolio Equity",
colorBlue, styleLine );<FONT face="Microsoft Sans Serif"
color=#008000 size=2>//Plot(cash, "Cash",
colorGreen, styleArea );<FONT color=#0000ff
size=2>Plot(dr, <FONT color=#ff00ff
size=2>"Drawdown", colorDarkRed, styleArea
);Plot(
Foreign(<FONT
color=#ff00ff size=2>"~~~EQUITY", <FONT
color=#ff00ff size=2>"O"), <FONT color=#ff00ff
size=2>"Long only", colorGreen );<FONT
color=#0000ff size=2>Plot( <FONT color=#0000ff
size=2>Foreign(<FONT color=#ff00ff
size=2>"~~~EQUITY", <FONT color=#ff00ff
size=2>"H"), "Short
only", colorRed );<FONT
face="Microsoft Sans Serif" color=#008000 size=2>//<FONT
color=#008000 size=2>Plot(bslh, "#bars since last high", colorDarkYellow,
styleLine | styleOwnScale, 0, 10 * LastValue( Highest( bslh ) )
);islastbar = <FONT color=#0000ff
size=2>Status(<FONT color=#ff00ff
size=2>"lastbarintest");isfirstbar = <FONT
color=#0000ff size=2>Status(<FONT color=#ff00ff
size=2>"firstbarintest");bar = <FONT
color=#0000ff size=2>BarIndex();firstbar =
LastValue(
ValueWhen( isfirstbar,
bar ) );lastbar = <FONT color=#0000ff
size=2>LastValue( <FONT color=#0000ff
size=2>ValueWhen( islastbar, bar ) );al =
LastValue(
ValueWhen( islastbar,
LinRegSlope( eq,
Lastbar - firstbar ) ) );bl = <FONT color=#0000ff
size=2>LastValue( <FONT color=#0000ff
size=2>ValueWhen( islastbar, <FONT color=#0000ff
size=2>LinRegIntercept( eq, Lastbar - firstbar ) )
);Lr = al * ( BarIndex<FONT
size=2>() - firstbar ) + bl;Lr = <FONT color=#0000ff
size=2>IIf( bar >= firstbar AND bar <= lastbar ,
Lr, Null );<FONT face="Microsoft Sans Serif" color=#008000
size=2>//Plot( Lr , "Linear Reg",
colorRed, styleThick );
<FONT face=Tahoma
size=2>-----Original Message-----From: paultsho
[mailto:paultsho@xxxxxxxxxxxx]Sent: January 26, 2004 6:14
PMTo: amibroker@xxxxxxxxxxxxxxxSubject: [amibroker]
Re: Backtest using equity curveI've seen many
clever use of equityMy question in regard to the system below is
Is E1 the equity of just one stock, or the whole portfolio in
backtesting. and if I want to use the equity curve of the whole
portfolio, do i have to use the addtocomposite function instead of
E1=equity(1);thanks in advance./Paul.--- In
amibroker@xxxxxxxxxxxxxxx, "Herman vandenBergen" <psytek@xxxx>
wrote:> You can cascade as many systems as you like, even different
ones, and use> the Equity from the previous one as a parameter
in the next system. I know> this can be done with the old
backtester and think it should also work in> the new PF
tester.> > // system one code here> E1 =
Equity(1);> > // System two code here> Buy = Buy and
(some function of E1);> E2 = Equity(1);> > // System
three code here> Buy = Buy and (some function of E2);> E3 =
Equity(1);> etc.> > You essentially redefine the buy
signal as often as needed (afl executes> line after line and
never looks back), the last definition will be what> determines
your results.> > Herman> >
-----Original Message-----> From: Glenn
[mailto:glennokb@xxxx]> Sent: November 12, 2003 1:35
PM> To: amibroker@xxxxxxxxxxxxxxx>
Subject: [amibroker] Backtest using equity curve> >
> Hi,> > I'm was wondering if
it is possible in AB to incorporate the equity
curve> of a system within a backtest, using it to test
the following:> > a. No new entries if a closed
trade crosses below a moving average of> the equity
curve and re-enter when a closed trade crosses above
the> moving average. Another idea is to use a
percentage on the equity curve> instead of a moving
average.> > b. Using the above also test
tightening the actual trailing stop on the> open
trades. ie: if a closed trade crosses below a moving average
(or> whatever) then instead of using a 3 x ATR stop
then use a 2 x ATR stop> on the open
trades.> > Note that the trades in between the
exit and entry need to be tracked for> the
re-entry.> > If this is possible, do you know
how to set it up please?> > Cheers,
Glenn> >
> Yahoo! Groups
Sponsor>
ADVERTISEMENT> > > > > Send
BUG REPORTS to bugs@xxxx> Send SUGGESTIONS to
suggest@xxxx>
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