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How do you evaluate a regression model (MAE, RMSE, R², MAPE)?

Regression needs different metrics than classification, and each tells a different story. The signal is knowing what RMSE vs MAE vs R² vs MAPE actually measure and their failure modes around outliers, scale, and zeros.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Regression needs different metrics than classification, and each tells a different story. The signal is knowing what RMSE vs MAE vs R² vs MAPE actually measure and their failure modes around outliers, scale, and zeros.

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