Thread: MetaTrader Historical Data Quality

I have been running the same MQL4 program on the same historical data and getting different results. While the data is supposed to be historical, I am under the impression that there is some randomness built in. Since I am trying to tweak a trading model by slight changes to the parameters I am having a very hard time comparing results.

I believe that as you do a back test the process looks at the current spread so as you take different runs you are getting slightly different results. Maddening really. We work to keep the variables down to get the most accurate test. Maybe it is a good thing as it gives you different forces and you will meet them in the market anyway.

I agree that the variations can be helpful for backtesting, but it's quite a surprise when I first realized it!

Originally Posted by michel1954

I agree that the variations can be helpful for backtesting, but it's quite a surprise when I first realized it!

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Glad to help you.

thanks for the great help and I will be using the information.

Hello, I can import tick, minute data and floating spread into MT4. If you're wondering how I achieved this, I can tell about this=)