Validating a gold model runs in sequence: in-sample description, out-of-sample testing in a different volatility regime, cost realism with real XAUUSD spreads and slippage, perturbation checks, forward demo and small live.
Go-live criteria — minimum sample, minimum expectancy after costs, maximum acceptable drawdown in dollars per ounce and the size-reduction trigger — must be written before testing starts, not after results appear.
Validation is the discipline of trying to break your own gold model before the market does it for you at full size. A model that has not survived deliberate attack has not been validated, it has merely been admired.
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