Question: (a) Explain why the R2 as a goodness-of-fit measure for the LR model is highly vulnerable to any mean-heterogeneity in data Z0:=(y,X). (b) Explain the

(a) Explain why the R2 as a goodness-of-fit measure for the LR model is highly vulnerable to any mean-heterogeneity in data Z0:=(y,X).

(b) Explain the relationship between the R2 and the F-test for the joint significance of the coefficients β1 in an LR model.

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