Using the Cook's Distance Statistic D_i to Determine Influential Points

question 63

Multiple Choice

Using the Cook's distance statistic D_i to determine influential points in a multiple regression model with k independent variable and n observations and letting denote the critical value of an F distribution with v₁ and v₂ degrees of freedom at a 0.50 level of significance,X_i is an influential point if

• A)D_i < F_n-k-1,k+1.
• B)D_i < F_k+1,n-k-1.
• C)D_i > F_k+1,n-k-1.
• D)D_i > F_n-k-1,k+1.

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