When backtesting i have used 5 min chart however i want to see longer periode and if i chose 1 hours or 2 hours frame i get more historical data. My question is when backtesting let say 4 hour chart , does the program know when the stop loss occured or profitt target occured within that candle stick on 4 hour? or does it just look at the close price?
No. Current version will always assume that the profit was hit first – leading to very misleading and incorrect results. PRT are working on fixing this in the next version – they call it tick by tick testing. Other platforms call this look inside bar testing. You will find a lot of mention about this in various places on this web site. Be careful – if your backtest results look to good to be true, they probably are.
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