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Answers for “Z-score 公式是什么?”

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Understand why

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Standardization centers data at the mean (μ\mu), so values below the mean become negative. Min-max normalization shifts and scales data so the minimum becomes 0 and the maximum becomes 1, keeping all values non-negative within [0, 1].

Conditions: Standardization uses z=x−μσz = \frac{x - \mu}{\sigma}.; Min-max uses Xnorm=X−Xmin⁡Xmax⁡−Xmin⁡X_{\text{norm}} = \frac{X - X_{\min}}{X_{\max} - X_{\min}}.

Understand why

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In machine learning, different features may have entirely different magnitudes. Without processing, features with larger magnitudes may dominate the model training process.

Conditions: Suitable for datasets where features differ greatly in units or magnitude

Understand why

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In machine learning, normalization is used to scale different features to the same scale, preventing features with larger numerical values from dominating model training and thus avoiding inconsistency. If features differ greatly in magnitude, the algorithm may become biased.

Conditions: Suitable for datasets where features differ greatly in units or magnitude