Outliers, Leverage Points & Cook's Distance – Practice Quiz

Assess influential regression observations in delivery, retail and laboratory settings. Prerequisites: multiple regression, residuals and error variance. Compute leverage screens, deleted residuals, Cook distance, DFFITS and DFBETAS. Investigate masking, rank loss and practical sensitivity without treating diagnostic cutoffs as deletion rules. Includes single-select and multiselect questions, worked solutions and content-based distractor feedback.

References: Penn State: Influential Points, statsmodels: OLS Influence.

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