Hi,
Your question is actually a bit of a trick question, since AmiBroker
will cap the number of signals to be not more than 2 x the maximum
permitted open positions (as per your AA settings or in code). To get
around that, set the max positions to some large number (e.g. 500).
That being said, you can count (and even chart) the number of signals at
each bar. Similarly, you can evenly divide your equity among all signals
such that all signals will be taken (up to max permitted).
Have a look at the following (untested) code for some ideas. Run a
backtest against it, then look at the resulting plot to see how many
signals are generated at each bar.
Mike
SetOption( "MaxOpenPositions", 2 );
fast = MA( Close, 5 );
slow = MA( Close, 25 );
Buy = Cross( fast, slow );
Sell = Cross( slow, fast );
AddToComposite( 0, "~Signals", "X", atcFlagDefaults |
atcFlagEnableInPortfolio );
PlotForeign( "~Signals", "Signals", colorRed, styleLine );
SetCustomBacktestProc( "" );
if ( Status( "action" ) == actionPortfolio )
{
maxPositions = GetOption( "MaxOpenPositions" );
signals[0] = 0;
bo = GetBacktesterObject();
bo.PreProcess();
for ( bar = 0; bar < BarCount; bar++ )
{
count = 0;
for ( sig = bo.GetFirstSignal( bar ); sig; sig =
bo.GetNextSignal( bar ) )
{
if ( sig.IsEntry() )
{
count++; // AmiBroker tracks as many as 2 x
maxPositions
}
}
signals[bar] = count; // Preserve signal count for charting
count = min( count, maxPositions ); // Do not exceed
maxPositions
if ( count > 0 )
{
size = -100 / count; // Divide evenly among candidates
}
else
{
size = -100; // Prevent divide by zero error.
}
size = max( size, -5 ); // Max 5% of equity (or whatever makes
sense to you)
for ( sig = bo.GetFirstSignal( bar ); sig; sig =
bo.GetNextSignal( bar ) )
{
if ( sig.IsEntry() )
{
sig.PosSize = size;
}
}
bo.ProcessTradeSignals( bar );
}
bo.PostProcess();
AddToComposite( signals, "~Signals", "X", atcFlagDefaults |
atcFlagEnableInPortfolio );
}
--- In [email protected], "richpach2" <richpa...@...> wrote:
>
> A portfolio backtester outputs a long list of system metrics but, I
> was not able to find a metric which describes a value of cash / system
> utilization. What I mean by that is, do I have enough cash to take all
> the signals? After all most systems work on the principle that one
> must take ALL signals. Not some not a few but ALL. I know I can
> control it by positionscore, positionsize and number of open positions
> as a percentage of portfolio (cash). I want to be able to use my cash
> in most efficient way by matching a number of signals the system
> generates on the portfolio with number of available positions. At
> least, I want to know how many signals are generated for the given
> period in test and compare it to total number of trades taken during
> the test period.
> I can see that, there are visual (Green bars) on the equity display
> that show available cash but I can not see anything in the backtester
> which will measure number of signals compared a number of positions.
> Portfolio backtester interface reference guide shows that one can use
> "cash" property in FindSignal and FindOpenPositions but, I do not know
> how to construct my metric using these methods.
> Can someone please comment on this question or point me to the
> examples on how to use custom methods in backtester?
>
> Regards
> Richard
>
