Question: The model is Y X e with E[e j X] 0 and X 2 R. Consider the estimator e 1 n Xn

The model is Y Æ X Åe with E[e j X] Æ 0 and X 2 R. Consider the estimator e¯ Æ

1 n

Xn iÆ1 Yi Xi

.

Find conditions under which e¯ is consistent for ¯ as n!1.

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