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Hi,
Your question has been asked a number of times in the forum. Here is a link to one answer previously posted:
http://finance.groups.yahoo.com/group/amibroker/message/129312
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "Corey Saxe" <cesaxe@xxx> wrote:
>
> Hi Ed,
>
> I don't use MaxOpenPositions because it pertains to open positions in multiple symbols at one time, (Portfolio trading).
> I can set it to 3 and still easily open more than 3 contracts at a time in one symbol, like the old backtester. And that's all I'm trying to do.
> Just increase or decrease the number of contracts to trade in just one symbol, depending on the current equity.
>
> Using:
> Eq = Foreign("~~~EQUITY", "C");
> Does return the correct equity for use in a backtest, but the backtest button has to be pushed twice.
>
> I think that in the end, unless I'm missing something simple, I'll have to manually program separate code to keep track of my equity.
>
> -CS
>
> ----- Original Message -----
> From: Edward Pottasch
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Thursday, May 28, 2009 3:02 AM
> Subject: Re: [amibroker] Using Equity to Compute Position Size
>
>
>
>
>
>
> Hi Corey,
>
> you can use equity but indeed you need one level deeper inside the backtest code. What I do not understand is why MaxPositions does not seem to work on a higher level backtest. Will ask Marcin later.
>
> I will maybe try to code using Equity in the custom backtester later.
>
> But on a higher level in the backtester you need to use PositionSize for reasons Graham gave.
>
> I use Equity on this higher level though. For instance I have written code that takes a profit per day at e.g. 500$, or per trade at e.g. 150$. What I do is that I let the code first calculate the equity without these restrictions and then feed the resulting equity into a procedure that takes the profits. So basicly within 1 AFL code the equity curve is calculated twice.
>
> But I do not see you can use that for your question.
>
> And yes if you use:
>
> PositionSize = -10;
> SetOption("MaxOpenPositions", 3);
> RoundLotSize = 1;
> MarginDeposit = 5000;
> TickSize = 0.25;
> PointValue = 50;
>
> the equity curve should not be able to explode because the MaxOpenPositions is set to 3. But I also see it explode because it takes more than 3 positions as the equity increases. This seems to be wrong. I will ask marcin or TJ.
>
> regards, Ed
>
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