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Yes it is dynamic depending as the trade progress but the way to calculate RR does not take the system's edge into account. Anyone can simply say I'm risking 10 pips for a 12 pips target... well what is the odd of that happening? The point I'm trying to make is that first find the success rate of your edge and then calculate. Not simply, I'm risking 20 pips for 10 pips target so RR is 0.5 (below 1) and its bad or I'm risking 10 pips for 15 pips so the RR is 1.5 now so its good. First and foremost a trader must know the odds. Backtest/forward...
Yes, we are in agreement. Expectancy is the product of RR and win rate.