I don't know if this can be somehow done automatically but each formula can be 
tested manually if it looks into the future. See the screenshot here:

http://img227.imageshack.us/img227/8584/checkfuture5nd.png

Lester

--- In [email protected], "Chris" <[EMAIL PROTECTED]> wrote:
>
> If I have a trading system such as this:
> 
> Buy = Cross( Close , EMA(Close, 10) );
> Sell = Cross( EMA(Close, 10) , Close );
> 
> and my buy and sell price settings are set to "Open" with Buy Delay = 
> 0, I have an untradeable system because the closing prices are not 
> known until after the trade has executed (open). If backtested, AB will 
> give unrealistic returns because the system is allowed to peek into the 
> future (knowing the closing prices at the open). Shouldn't AB detect 
> this sort of situation and flag the user? Would this be a worthwhile 
> feature request?
>







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