Strategy test - "open price" very different results vs "every tick"

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Wonder if anyone here could provide some advice:-

Most of the strategies I have tested with "open price" and "every tick" gave very close results. But for some strategies tested show very different results - which is correct? Must the strategies be tested with "every tick" to give a results similar to "open price"?

Thanks very much

 

If you use Bar[0] for your strategy, test results will be different; if not - close

 
Roger wrote >>

If you use Bar[0] for your strategy, test results will be different; if not - close

Got it, thank you :-)

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