Questions on backtester

 

Hi

Does anyone here ever get a very different backtest result with 2 different data source . I m testing a EA by using the 06-08 data from Alpari and Metaquotes respectivitely, the total profit could be 50% different over 2 years testing period.. And both of the modelling quality is about 90%. Just no clue what could be the cause and which result is trustable

Regards

Tom

 

Two reasons: different price quoted by two different brokers (less likely to affect your results to such an extent), different stop levels and/or spreads (more likely to affect your results).


As for the trustable results I guess the trustable one is the result for the broker you are going to actually trade with.

Reason: