Large-N and Large-T Properties of Panel Data Estimators and the Hausman Test



J-1

2 (CD) T


Jx,T1

I Gχ,τAιGχ,τ + -√T-Dχ,τA3Dχ,



-1


1 1    ∏r≈. J J    JxT „

Niπ? ''ntgxt A2 + D

(A4 + A5)


By Lemma 2(d), (b), and (d),

B5 = Op (1),
NTGχ,τA2 = Op (1),
Dx,T A5 = Op (1) ,

respectively. Under the fixed effect assumption (Assumption 10), Lemma 4
implies that

Dx,T A4 = Op (1) ,

as (N, T →∞) . Since


1J          -T1

r- 2 , -XT = o (1) ,
√Ntθ
T

and

1

= op (1)


Tθ2 (C0Dx,T


JxT JxT

Gχ,τ AιGχ,τ + -√=-Dχ,τ A3Dχ,τ -√=∙

(as shown in Part (a)), we have

(B4 + B5) - C0 μθ2A1 + A3^   μθ2A2 + (A4 + A5)^ = B4 + op (1) .  (98)

But, according to Lemma 4,

B4 = N X ZiUi p lZΞλ.

i


(99)


Therefore, (94), (97), (98) and (99) imply
γg p γ + (lZξ1z) 1 lZΞλ,
as (N, T →∞) . ¥

Proof of Theorem 9

Using the notation in (87), we can express the Hausman test statistic by

HMNT


[(A1 + θTF1¢ 1 NT (A2 + θTF2) - Af1NτA2] 0

× hσVA1 1 - σ2 (A1 + θ2TF1)  i

× [(A1 + θTF1)-1 NT (A2 + θTF2) - Af 1NτA2] .

60



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