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Robustness in general refers to a statistic's insensitivity to deviations from its underlying assumptions (Huber and Ronchetti, 2009).

1 vote

Distinguishing Bad Leverage Points from Vertical Outliers

Your first plot uses a straight horizontal line through residuals to determine upper and lower bands of +/- 2.5 for outlier determination, and most of the data seems well modeled by the horizontal str …
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