I'm paper trading a rule-based system using CMC data, and a lot of times entry signals are on CMC's data but not the ASX, so I'm a bit concerned. I suppose it should be fine if I make sure I use CMC for the duration of the backtest? Only problem is, I'm not sure how their prices are evaluated... if it's based on some unknown and not market variables, then I'm not sure if I should expect the same or similar results using a DMA provider, which I will do with real money (probably Mac).
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