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Trading Reference Links
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Use bo.ScaleTrade. Take a look at TJ's example:
http://www.amibroker.com/kb/2006/03/06/re-balancing-open-positions/
PS
--- In amibroker@xxxxxxxxxxxxxxx, "rashidfarah_98"
<rashidfarah_98@xxx> wrote:
>
> Does any one know how to exit from a position partially
> after it rises a certain % in relation to the
> available portfolio equity?
>
>
> For example, if I initially start with $50,000,then
> open 10 positions each holding $10,000. That is 20% of
> the total equity for each position.
> Now, I would have a trailing stop to exit say 7%. But
> also I would not allow a position to comprise more
> than 30% of the total portfolio equity. Once the
> position reaches 30% of folio I sell 10% and keep the
> value that is equivalent to the original 20%.
>
> So the question is how do I exit partially. It seems
> this has to be done within portfolio backtester.
>
> I know the following:
> 1- total equity:
> CurrentPortfolioEquity = bo.Equity;
> 2- The value of each open position
> nInvestedValue = 0;
> for(openpos = bo.GetFirstOpenPos(); openpos; openpos =
> bo.GetNextOpenPos()) {
> nInvestedValue = nInvestedValue +
> openpos.GetPositionValue();
> nOpenPositions++;
> }
>
> Now you there is something similar as shown in the code
> bellow. But, this is at the system level and generic
> for all positions.
> I am not sure we can link this with "bo.Equity".
>
> Can anyone help by pointing me the way.
>
> Thanks,
> Rashid
>
> ==================
> 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 == 0 AND
> High[ i ] >= ( 1 + FirstProfitTarget * 0.01
> ) * priceatbuy )
> {
> // first profit target hit - scale-out
> exit = 1;
> Buy[ i ] = sigScaleOut;
> }
>
> if( exit == 1 AND
> High[ i ] >= ( 1 + SecondProfitTarget * 0.01
> ) * priceatbuy )
> {
> // second profit target hit - exit
> exit = 2;
> SellPrice[ i ] = Max( Open[ i ], ( 1 +
> SecondProfitTarget * 0.01 ) * priceatbuy );
> }
>
> if( Low[ i ] <= ( 1 - TrailingStop * 0.01 ) *
> highsincebuy )
> {
> // trailing stop hit - exit
> exit = 3;
> SellPrice[ i ] = Min( Open[ i ], ( 1 -
> TrailingStop * 0.01 ) * highsincebuy );
> }
>
> if( exit >= 2 )
> {
> Buy[ i ] = 0;
> Sell[ i ] = exit + 1; // mark appropriate
> exit code
> exit = 0;
> priceatbuy = 0; // reset price
> highsincebuy = 0;
> }
> }
> }
>
> SetPositionSize( 50, spsPercentOfEquity );
> SetPositionSize( 50, spsPercentOfPosition * ( Buy ==
> sigScaleOut ) ); // scale out 50% of position
>
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