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Using the Studentized Residuals Tᵢ to Determine Influential Points in a Multiple

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Using the Studentized residuals tᵢ to determine influential points in a multiple regression model with k independent variable and n observations and letting tn₋k₋₂ denote the upper critical value of a two-tail t test with a 0.10 level of significance, Xᵢ is an influential point if


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