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Hi Bruce
I'm making use of these techniques to output a list of OOS trades to a file.
By using a StaticVar for control, I've output a header row to the first line of the file.
All is great except that I can't find a means of determining the last OOS pass so that the StaticVar can be reset for subsequent WalkForward runs.
Any suggestions please.
Graham
--- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@xxx> wrote:
>
> Bruce - just wanted to report that your code worked like a charm!
> You're my new hero. :-)
>
> I was in the process of sketching out an OLE project to simulate a
> multi-variable Walk-Forward tester. Given my mediocre programming
> abilities, that probably would have taken me a couple of months to get
> right. Now, thanks to your code, I can just use the normal
> Walk-Forward engine, and achieve what I wanted.
>
> In the future, it would be nice if AB had this IS/OOS, and other
> flags, readily built-in. I will suggest as much to the official
> suggestions webpage.
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@> wrote:
> >
> > Bruce, thanks a bunch. That's a nifty solution.
> >
> > It will take me a few days to play around with it, and I will post any
> > questions here should they come up. But it looks like it will do
> > exactly what I was hoping for!
> >
> > Thanks again.
> >
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "bruce1r" <brucer@> wrote:
> > >
> > > Part II -
> > >
> > > I mentioned that I had needed to detect IS/OOS in walk-forward testing
> > > for signal work. It is actually needed for several applications, and
> > > again I hope that Tomasz adds the status property. Below is a brief,
> > > demo example that might be of use. Side note - Yahoo really sucks for
> > > doing this ! At least, I've met my yearly posting target for 2009 :-)
> > >
> > > It is a very simple 2MA crossover optimization that was used to
> > > initially test OptSampleType(). It is NOT meant to be practical. It
> > > can be run, for example, on the SP500 in "Easy mode" as follows -
> > >
> > > Start - 12/31/2001
> > > End - 12/31/2002
> > > Last - 9/30/2003
> > > Step - 3 months
> > > NOT anchored
> > > Optimization target - CAR/MDD
> > >
> > > These parameters don't have to be used, but this example shows some
> > > interesting tidbits. For example, it show the limitations in
> > > transitioning from a bear to a bull period with limited lookback. It
> > > also shows some boundary effects in the walk-forward mode. But these
> > > are stories for another day.
> > >
> > > Anyway, here's a snippet of the _Trace output -
> > >
> > > Name = SP-CP , ActionEx = 14 , From = 6/30/2003 , To = 9/30/2003 ,
> > > OptSampleType = 3
> > > Fast = 45 , Slow = 49
> > > Signals -
> > > BUY - 6/30/2003
> > > SELL - 8/15/2003
> > > BUY - 8/27/2003
> > > SELL - 9/10/2003
> > > BUY - 9/17/2003
> > > Name = SP-CP , ActionEx = 14 , From = 9/30/2003 , To = 12/31/2003 ,
> > > OptSampleType = 3
> > > Fast = 97 , Slow = 75
> > > Signals -
> > > SELL - 9/30/2003
> > >
> > > Finally, the code -
> > >
> > >
> >
> //--------------------------------------------------------------------------------------------------
> > > //
> > > // Simple 2MA Optimization.afl - 1/18/09
> > > //
> > > // Example to show use of OptSampleType() function. Note that this
> > > is meant as a
> > > // non-practical example that demonstrates a special case and a
> > > boundary condition
> > > // related to signals in a walk-forward optimization.
> > > //
> > >
> >
> //--------------------------------------------------------------------------------------------------
> > >
> > > #include <OptSampleType.afl>
> > >
> > > // Get the optimization pass type - this must be outside of any
> > > conditionals
> > > samptype = OptSampleType( );
> > >
> > > // Test routine for OptSampleType
> > >
> > > // Choose an engine and set a simple, short optimization
> > > OptimizerSetEngine( "spso" ); // cmae, trib
> > > OptimizerSetOption( "Runs", 2 );
> > > OptimizerSetOption( "MaxEval", 500 );
> > >
> > > // Simple 2 MA crossover system
> > > fast = Optimize( "Fast MA", 13, 1, 100, 1 );
> > > slow = Optimize( "Slow MA", 55, 1, 100, 1 );
> > > Buyimp = Cross( MA( C, fast ), MA( C, slow ) );
> > > Sellimp = Cross( MA( C, slow ), MA( C, fast ) );
> > > Short = Cover = 0;
> > >
> > > // Handle a signal in progress at the start of the period - note that
> > > // this will introduce a few redundant signals (if first signal
> of OOS
> > > // period is the same as the last signal of the last OOS period).
> > These
> > > // will have to be filtered later, but it is the easiest way for this
> > > demo
> > > Buystate = Flip( Buyimp, Sellimp );
> > > Sellstate = NOT Buystate;
> > > fbir = Status( "firstbarinrange" );
> > > Buy = Buyimp OR fbir * Buystate;
> > > Sell = Sellimp OR fbir * Sellstate;
> > >
> >
> //--------------------------------------------------------------------------------------------------
> > >
> > > // Debug output
> > > if ( samptype == 3 )
> > > {
> > > _TRACE ( "Name = " + StrLeft( Name( ) + " ", 5 )
> > > + " , ActionEx = " + Status( "actionex" )
> > > + " , From = " + NumToStr( DateTimeConvert( 2, Status(
> > > "rangefromdate" ) ), formatDateTime )
> > > + " , To = " + NumToStr( DateTimeConvert( 2, Status( "rangetodate"
> > > ) ), formatDateTime )
> > > + " , OptSampleType = " + samptype
> > > );
> > > _TRACE( " Fast = " + fast + " , Slow = " + slow );
> > > }
> > >
> > > // Show the signals for the out-of-sample period
> > > if ( samptype == 3 )
> > > {
> > > bi = BarIndex( );
> > > bi = bi - bi[ 0 ];
> > > dt = DateTime( );
> > > fbi = LastValue( ValueWhen( Status( "firstbarinrange"), bi ) );
> > > lbi = LastValue( ValueWhen( Status( "lastbarinrange" ), bi ) );
> > > _TRACE( " Signals - " );
> > > for ( i = fbi; i <= Lbi; i++ )
> > > {
> > > if ( Buy[ i ] )
> > > _TRACE( " BUY - " + NumToStr( dt[ i ], formatDateTime ) );
> > > if ( Sell[ i ] )
> > > _TRACE( " SELL - " + NumToStr( dt[ i ], formatDateTime ) );
> > > }
> > > }
> > >
> > >
> >
> //--------------------------------------------------------------------------------------------------
> > >
> >
>
------------------------------------
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