55. a. Show that , so that is an unbiased estimator for ai (in the xed effects...

Question:

55.

a. Show that , so that is an unbiased estimator for ai (in the xed effects model).

b. With ,show that is an unbiased estimator for gij (in the xed effects model).

gˆ

ij gˆ ij Xij# Xi ## X#j# X###

E1Xi ## X### 2 ai Xi## X###

50,443,409 x2 x ij# 2 ijk 16,815,853

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