Diagnostics for Leverage and Influence - Leverage

6 important questions on Diagnostics for Leverage and Influence - Leverage

What is the importance of the hat matrix in identifying influential points?

H = X(X'X)⁻¹X' determines variance : covariance of

How is the diagonal element ℎ

hat matrix diagonal; ℎ

How does the hat matrix determine variance and covariance of

It projects the observed values into fitted values (
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What is meant by amount of leverage?

The elements of ℎ

How are diagonal elements of ℎ

Since the diagonal element ℎ

How are Studentized residuals used?

Studentized Residual (R-student): Interval: uses full data set to estimate error variance

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