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Got it now. It became much clearer to me when I used unrelated spike signals
for a long-only test, like
entry:=Cross(C,Mov(C,21,E));
exit:=Cross(15,Stoch(3,3));
Then all the plots are identical except the initial bars. Your new
formulation keys off the fact that
x:=ValueWhen(1,entry-exit<>0,entry-exit);
long:=x=1
AND (Alert(x<>1,2) OR Cum(IsDefined(x))=1);
short:=x=-1
AND (Alert(x<>-1,2) OR Cum(IsDefined(x))=1);
means you don't care whether its an entry or an exit signal (or isdefined)
that comes first.
Thanks Jose, this is very useful.
Andrew
-----Original Message-----
From: Andrew Tomlinson [mailto:andrew_tomlinson@xxxxxxxxxxx]
Sent: Saturday, February 12, 2005 3:57 PM
To: Metastockusers@xxxxxxxxxxxxxxx
Subject: RE: [Metastockusers] Re: A better trade binary
Thanks Jose.
The formula is a crossover system that reverses from long to short when the
close crosses the band whose limits are defined by the 21 and 10 day EMAs,
and vice versa. The formulation
entry:=C>Mov(C,10,E);
exit:=C<Mov(C,21,E);
is non-intuitive to me, since by itself it creates whipsaws. My instinctive
reaction was to do what I would do for my own code, which was to move it
around to create something that was clearer to my skill level. However, as a
result I changed a formulation where entry and exit were independent
variables to one where they were dependent, inadvertently side-stepping half
the point of your example (I imagine the ability to avoid repeated signals
of unrelated entries and exits is connected to the property you pointed out,
of capturing the first exit, which is why the "signal" readout from the two
formulas looks so different).
I have to spend some more time on this tomorrow. Bear with us.
Andrew
-----Original Message-----
From: Jose [mailto:josesilva22@xxxxxxxxx]
Sent: Saturday, February 12, 2005 3:18 PM
To: Metastockusers@xxxxxxxxxxxxxxx
Subject: [Metastockusers] Re: A better trade binary
Andrew, for all practical purposes, your amended entry/exit signals
are almost identical to:
entry:=C>Mov(C,10,E);
exit:=C<Mov(C,21,E);
This makes it very unlikely that an exit signal will appear before an
entry, so the trade binaries for your system example will be
identical.
The answer to your question is then "yes", your particular example
precludes any differences in the trade binary or flag output.
However, try "signals" instead of "flag" for the last line of code,
and the missing first trade signal will then become apparent.
jose '-)
--- In Metastockusers@xxxxxxxxxxxxxxx, "Andrew Tomlinson"
<andrew_tomlinson@xxxx> wrote:
> I'm missing something. I can get the same results as the trade binary
> signals in the "new" formulation, while still using barssince, by a
> small change in the entry/exit inputs to the second formula, as
> follows:
>
> -------------------------------------------
> entry:=C>Mov(C,21,E) AND C>Mov(C,10,E);
> exit:=C<Mov(C,10,E) AND C<Mov(C,21,E);
>
> Init:=Cum(entry+exit>-1)=1;
> entryInit:=Cum(entry)=1;
> flag:=BarsSince(Init OR entry)
> <BarsSince(Init OR exit)+entryInit;
> signals:=(entryInit AND Alert(entryInit=0,2)
> OR flag AND Alert(flag=0,2))
> -(flag=0 AND Alert(flag,2));
> flag;
> -------------------------------------------
>
> Is this just a product of this particular example?
>
> Andrew
>
>
>
> -----Original Message-----
> From: Jose [mailto:josesilva22@x...]
> Sent: Friday, February 11, 2005 10:04 AM
> To: Metastockusers@xxxxxxxxxxxxxxx
> Subject: [Metastockusers] A better trade binary
>
>
> I recently stumbled on an improvement to the basic trade binary code,
> which allows the use of ValueWhen() instead of BarsSince() MetaStock
> functions.
>
> Avoiding the BarsSince() function means that the indicator code now
> does not need to wait for the first entry signal before plotting an
> exit signal. This is best illustrated by plotting and comparing the
> two trade signal indicators below.
>
>
> MetaStock -> Tools -> Indicator Builder -> New ->
> Copy and paste complete formulae between "---8<---" lines.
>
>
> ====================
> System trade signals
> ====================
> ---8<--------------------------
>
> { System trade signals - note: simultaneous
> Long/Short signals cancel each other }
> { http://www.metastocktools.com }
>
> { Signals reference example }
> entry:=C>Mov(C,21,E);
> exit:=C<Mov(C,10,E);
>
> { User inputs }
> plot:=Input("Signals: [1]Clean, [2]All, [3]Trade binary",1,3,1);
> delay:=Input("Entry and Exit delay",-1,5,0);
>
> { Clean signals }
> x:=ValueWhen(1,entry-exit<>0,entry-exit);
> long:=x=1
> AND (Alert(x<>1,2) OR Cum(IsDefined(x))=1);
> short:=x=-1
> AND (Alert(x<>-1,2) OR Cum(IsDefined(x))=1); signals:=long-short;
> binary:=ValueWhen(1,signals<>0,signals);
>
> { Plot in own window }
> Ref(If(plot=1,signals,
> If(plot=2,entry-exit,binary)),-delay)
>
> ---8<--------------------------
>
>
> ===============================
> System trade signals - original ===============================
> ---8<--------------------------
>
> { Original trade signals code }
> { BarsSince() function prevents first exit plot}
> { With thanks to Roy Larsen at
> http://www.metastocktips.co.nz }
>
> { Signals reference example }
> entry:=C>Mov(C,21,E);
> exit:=C<Mov(C,10,E);
>
> { User inputs }
> plot:=Input("Signals: [1]Clean, [2]All, [3]Trade binary",1,3,1);
> delay:=Input("Entry and Exit delay",-1,5,0);
>
> { Clean signals }
> Init:=Cum(entry+exit>-1)=1;
> entryInit:=Cum(entry)=1;
> flag:=BarsSince(Init OR entry)
> <BarsSince(Init OR exit)+entryInit;
> signals:=(entryInit AND Alert(entryInit=0,2)
> OR flag AND Alert(flag=0,2))
> -(flag=0 AND Alert(flag,2)); binary:=ValueWhen(1,signals<>0,
signals);
>
> { Plot in own window }
> Ref(If(plot=1,signals,
> If(plot=2,entry-exit,binary)),-delay)
>
> ---8<--------------------------
>
>
> jose '-)
> http://www.metastocktools.com
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