= Regression outlier
A <regression outlier> has a response unusually far from its fitted conditional mean. A <standardized regression residual> adjusts for <regression leverage>; an externally studentized residual also estimates noise <variance> with the observation deleted. Selecting the largest residual among many observations changes its reference distribution. An outlier need not be an <influential observation>, and unusual valid data should not be discarded solely for being unusual.
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