AdvancedNumeric answer
One influential observation · Part 3 of 3
For a regression with two fitted coefficients (including intercept), consider an observation with residual 2, mean squared error 4 and leverage 0.50. Use Cook distance , where .
Return to the first observation (leverage 0.50). Suppose MSE is re-estimated as 2 while residual and leverage stay fixed. What is the new Cook distance?
Answer with a number. Fractions, powers and expressions like 23/6 or C(52,5) are read correctly in practice.
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