wrong data in strategy tester XAUUSD M1

Sergey Golubev  

If you are using "every tick based on real ticks" mode with MT5 so your data is same as you are trading it with Metatrader 5 with your broker (because it is the broker's data for backtesting).

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Testing trading strategies on real ticks and the explanation is on this post

Testing trading strategies on real ticks
Testing trading strategies on real ticks
  • www.mql5.com
The article provides the results of testing a simple trading strategy in three modes: "1 minute OHLC", "Every tick" and "Every tick based on real ticks" using actual historical data.