GetAccountValue Alternatives?

[usuallywin]

Hi,

I understand that GetAccountValue doesn't work on historical data.

How can I write a strategy that uses half of my capital on a instrument? It would be easy if I can write ((GetAccountValue()/2)/Close[0]) but it does not work when I backtest the strategy.

Is there a alternative way that it can be backtested? Thank you.

[NinjaTrader_Bertrand]

Thanks for the post, an alternative for backtesting would be using AccountSize -

http://www.ninjatrader.com/support/helpGuides/nt7/accountsize.htm

[usuallywin]

Thank you for your quick response.

AccountSize is good but I would like to manage my fund dynamically. How can I make the account size change based on my gain and loss?

Thank you.

[NinjaTrader_Bertrand]

Correct, per default it's a non dynamic set value - you can track the Pnl of your trades manually with custom variables though and as such create a dynamically adjusted account size for your strategy to use then in position size calculations as well.