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Answers for “异常值如何影响模型拟合?”

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Replacing an outlier with a typical value removes the extreme inflation from the sum of the dataset. This causes the arithmetic mean to drop significantly, reflecting the true central tendency of the majority of the data.

Conditions: The original dataset contains an outlier.; The replacement value is consistent with the majority of the data.; The sample size remains unchanged.

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An outlier is an unusual or extreme data point that takes very small or very large values compared to the majority of the dataset. In a scatter plot, it appears as a point clearly separated from the main cluster of data points.

Conditions: Applies to any dataset with records, observations, samples, or data points.