data quality

[hosein.htkd]

if we wanna take the EA wiht data hi quality backtest.how similar is the forward test to the backtest?

[l'andorrà]

That depends on the source of your back test data. If that data belongs to a different broker, then there can be no similarity at all. If they are, then it depends on your broker's real conditions. You can have very nice data but brokers still messing your trades. So the general answer is there is no expected 100% similarity...ever.