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May 23, 2025 · Fundamentals

Choosing the Right Error Metric: Variance, Covariance, MAE, MSE, and RMSE Explained

The article presents a comparative table of variance, covariance, RMSE, MAE, and MSE, detailing their definitions, formulas, units, core functions, and typical application scenarios, and offers guidance on selecting the appropriate metric for single‑variable versus multivariate analysis, robustness needs, and model optimization.