Chapters 8 & 9: Regression Wisdom and Re-Expressing Data

Question 1

Low-Leverage Points

Answer 1

Points that are close to the mean point (do not affect LSRL much if removed)

Question 2

High-Leverage Points

Answer 2

Points with unusually large or small x-values (far away from mean) (affect slope, y-intercept, or both substantially if removed)

Question 3

Influential Points

Answer 3

Points that, if removed, change the slope, y-intercept, and/or r-value substantially
(Outliers, High-Leverage, or Both)

Question 4

Log Transformation

Answer 4

Takes log of values to make the scatter plot more linear