Never understood why anyone in the US bothers to play the 2 zeros of roulette.'Edge' is your betting advantage over randomness.
eg Casino roulette table, the house has 0 and 00 slots to provide edge. Otherwise the house would not make money.
In trading you cannot prove you have an edge, unless it is some sort of guaranteed arbitrage trade.
However you can see if your trading system had an edge in the past with backtesting/sim trading/live trading, and the hope is that the edge will continue to exist in future trading.
In Europe there is only 1 zero and that is hard enough.

