Suppose the first column of X is all 1s, so the regression equation has an intercept. (a)
Question:
Suppose the first column of X is all 1’s, so the regression equation has an intercept.
(a) Show that
i ei = 0.
(b) Does
i ei = 0 help validate assumption (4)?
(c) Is
i i = 0? Or is
i i around σ
√n in size?
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