A Consistent Nonparametric Test for Causality in Quantile



Using (A.10) and (A.11-4), we have the following inequality;

Pr[Thml( J - JT)| > δ I supQ,(x)-Qθ(x)C}

Pr{ max { Thm2(J -J„,)| , TW'Jt - Jtl)| } > δ I supQβ(x)-Q(x)CT}

, for all δ > 0 .                                                             (A.12)

Invoking Lemma 1 and condition A2(iii), we have

Pr{ sup Qθ(x)-Qθ(x)Ct} 1 as T → ∞ .                   (A.13)

By (A.8) and (A.9), as T → ∞, we have

Pr{ max { Thm/2(Jt - Jtu) , Thm/2(Jt - Jtl) } > δ } 0, for all δ > 0.

(A.14)

Therefore, as T → ∞,

the L.H.S. of the inequality (A.12) - Pr { Thm/2(Jt - Jt )δ } 0 and

the L.H.S. of the inequality (A.12) 0 .

In summary, we have that if both Thm/2(JT-JTU) =op(1) and Thm/2(JT-JTU) =op(1),
then
Thm/2(^Jt - Jt ) = op (1).                                                         

Step 3: Asymptotic equivalence.

In the remaining proof, we focus on showing that Thm/2(JT-JTU) =op(1), with the proof
of
Thm/2(JT-JTL) =op(1) being treated similarly. The proof of Step 3 is close in lines
with the proof in Zheng (1998). Denote

HT(s,t,g)Kts{1(ytg(xt))-,}{1(ysg(xs))-,} and             (A.15)

J[g]


1

T (T -1) hm


T

t=1


T
HT(s,t,g).
st


(A.16)


Then we have JTJ[Q,] and JTUJ[Q, -CT]. We decompose HT (s,t, g) into
three parts;

HT(s,t,g)=Kts{1(ytg(xt))-F(g(xt)zt)}{1(ysg(xs))-F(g(xs)zs)}

13



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