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Sorry, the missing entry signals have nothing to do with the statement
I listed below. My problem is I am trying to implement a scale out
strategy for a system that has both long and short entries. I can get
the system to properly scale out of longs, 1 contract at a time using:
SetPositionSize( 3, spsShares );
SetPositionSize( 1, spsShares * ( Buy == sigScaleOut ) ); // scale out
1 contract
But for some reason the short scaling is not working correctly. Shorts
enter with only 1 contracts instead of 3 and this is using:
SetPositionSize( 3, spsShares );
SetPositionSize( 1, spsShares * ( Short == sigScaleOut ) ); // scale
out 1 contract
I have experimented with placing the SetPositionSize statements in
different locations within the code and it gives me different results.
If I understood what this code is doing I might be able to determine
the correct configuration. It seems having both statements in the same
code cause them to interfere with one another. All I need is for a
Long/Short system to scale out equally, 1 contract at a time after
entering with 3 contracts long or short.
It's late and I'm exhausted, I hope this request made sense.
Pete :-)
--- In amibroker@xxxxxxxxxxxxxxx, "Pete" <dryheat3@xxx> wrote:
>
> Ok, this last suggestion was very helpful. Thank again.
> But now I am having a situation where the system is not taking all the
> entry signals in the back tester. I am trying to understand why it
> might skip a valid entry signal when current position = 0 and there
> are no reasons I can see why any of these signals should be skipped.
> I am questioning the last line in the scale-out example given in the
> help file. Can you explain what this statement does and how it might
> affect entry signals?
> SetPositionSize( 50, spsPercentOfPosition * ( Buy == sigScaleOut ) );
>
> Thanks.
>
> Pete :-)
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Pete" <dryheat3@> wrote:
> >
> > BuyPrice??? Interesting, I tried using the SellPrice in the scale out
> > bar and that didn't work so I figured I was on the wrong trail.
> > I'm not exactly sure why it should work this way, but since the scale
> > out signal itself is defined as:
> > Buy[i] = sigScaleOut;
> >
> > I suppose it kinda makes since. But why is it working like this in the
> > first place? Why would the sigScalout parameter not more logically be
> > paired with the exit, like Sell[i] or Cover[i]???
> > If someone could explain this it will help more fully understand how
> > this section of code functions.
> > Thanks.
> >
> > Pete :-)
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@> wrote:
> > >
> > > You need to define the BuyPrice at the scaleout bar
> > >
> > >
> > > --
> > > Cheers
> > > Graham Kav
> > > AFL Writing Service
> > > http://www.aflwriting.com
> > >
> > >
> > >
> > > 2009/2/2 Pete <dryheat3@>:
> > > > I have spent several hours trying to implement the Scale-out
> strategy
> > > > using futures contracts. I have finally come to the conclusion
that
> > > > the example in the help file does not create a true scale out
> system.
> > > >
> > > > Here's what I found:
> > > > On the bar where a scale out is triggered, instead of
reporting the
> > > > target price that triggered the scale out, the back tester
actually
> > > > reports the open or close of that bar. (depending upon what
settings
> > > > are used in the trades tab). This does not match a real trading
> > > > environment where you would place sell limit orders at your
various
> > > > targets and wait for the price to hit them.
> > > >
> > > > I have spent many frustrated hours trying to get it to show the
> actual
> > > > target price as the exit price in the back tester but so far this
> > > > alludes me.
> > > > Here's an example of what I am trading in real life but so far
> cannot
> > > > write code to duplicate in the back tester:
> > > > Enter long 3 contracts.
> > > > Stop loss set at buy price minus 1.25 points
> > > > Target one set to buy price plus 1.25 points
> > > > Target two set to buy price plus 2.5 points
> > > > Remaining contract exits when close crosses below EMA(C, 20).
> > > >
> > > > The code below is what I have accumulated so far:
> > > >
> > > > Buy = <<Insert favorite buy signal here>>;
> > > > Sell = 0;
> > > > SystemExit = Cross(EMA(C, 20), Close);
> > > > // the system will exit
> > > > // 50% of position if FIRST PROFIT TARGET stop is hit
> > > > // 50% of position is SECOND PROFIT TARGET stop is hit
> > > > // 100% of position if TRAILING STOP is hit
> > > >
> > > > FirstProfitTarget = 1.25; // profit
> > > > SecondProfitTarget = 2.5; // in points
> > > > TrailingStop = 1.25; // also in points
> > > >
> > > > priceatbuy=0;
> > > > highsincebuy = 0;
> > > >
> > > > exit = 0;
> > > >
> > > > for( i = 0; i < BarCount; i++ )
> > > > {
> > > > if( priceatbuy == 0 AND Buy[ i ] )
> > > > {
> > > > priceatbuy = BuyPrice[ i ];
> > > > }
> > > >
> > > > if( priceatbuy > 0 )
> > > > {
> > > > highsincebuy = Max( High[ i ], highsincebuy );
> > > >
> > > > if( exit <= 2 AND
> > > > SystemExit[i] )
> > > > {
> > > > //system exit hit - exit any remaining contracts
> > > > SellPrice[i] = Close[i];
> > > > exit = 3;
> > > > }
> > > >
> > > > if( exit == 0 AND
> > > > High[ i ] >= FirstProfitTarget + priceatbuy )
> > > > {
> > > > // first profit target hit - scale-out
> > > > exit = 1;
> > > > Buy[ i ] = sigScaleOut;
> > > > }
> > > >
> > > > if( exit == 0 AND
> > > > High[ i ] >= SecondProfitTarget + priceatbuy )
> > > > {
> > > > // second profit target hit - exit
> > > > exit = 2;
> > > > Buy[ i ] = sigScaleOut;
> > > > //SellPrice[ i ] = Max( Open[ i ],
> > SecondProfitTarget + priceatbuy );
> > > > }
> > > >
> > > > if( Low[ i ] <= priceatbuy - TrailingStop )
> > > > {
> > > > // trailing stop hit - exit
> > > > exit = 3;
> > > > SellPrice[ i ] = Min( Open[ i ], priceatbuy -
> TrailingStop );
> > > > }
> > > >
> > > > if( exit >= 3 )
> > > > {
> > > > Buy[ i ] = 0;
> > > > Sell[ i ] = exit + 1; // mark appropriate exit code
> > > > exit = 0;
> > > > priceatbuy = 0; // reset price
> > > > highsincebuy = 0;
> > > > }
> > > > }
> > > > }
> > > >
> > > > SetPositionSize( 15, spsPercentOfEquity ); //Equity is set at
> > 10,000.00
> > > > SetPositionSize( 1/3, spsPercentOfPosition * ( Buy ==
> sigScaleOut ) );
> > > > // scale out 50% of position
> > > >
> > >
> >
>
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