RMSE (Root Mean Squared Error)

Root Mean Squared Error (RMSE) measures forecast accuracy by calculating the square root of the average squared differences between predicted and observed values.

Because larger errors are penalized more heavily, RMSE is particularly sensitive to extreme forecast deviations. This makes it useful for evaluating model robustness during volatile market phases.

RMSE is often interpreted alongside other performance metrics to provide a balanced view of predictive quality.

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