Nonparametric cointegration analysis



becomes singular, we recommend the rule-of-thumb m =2q. The corresponding critical values
are presented in Table 3. As is easy to see, the same rule-of-thumb applies to the lambda-max
test. The critical values of the lambda-max test, for
m =2q, and the weight functions Fk
chosen as in Lemma 3, are given in Table 4.

<Insert Tables 3-4 about here>

6.4. Estimation of the cointegrating vectors

The results in section 6.1 can also be used to derive consistent estimators of the

cointegrating vectors, as follows. Choose again m = 2q, and let H be the matrix of the r
eigenvectors corresponding to the r smallest eigenvalues of the generalized eigenvalue
problem
n2H AmH = Op(1). Moreover, using (37) we can write

^          - / ^                - ^ — 1 I

det[Am - λA^Lm + n 2Am j


0 0,


(36)


1 TT ∙ t 1      1 ∙       1         1 t1 t TT tI Â

where H is standardized such that H IAm + n


-, 1 -1 1 ^          _         __ . . _ _              , _ _ .

2/Am ) H = Ir. Then similarly to (33)


we can


write


√A                      √                    /V

H = ‰γГ1 + Rr l


where rank(Γ1) = s0, rank


Γ

2

V 2


(37)


with Γ1 and Γ2 stochastically bounded matrices. It follows now similarly to Theorem 3 that


H W Γ rRHR,.,γi ÷ γir,-A,R i ÷ 1 ` R ar γ2 ÷ WRr,γi .

Therefore, it follows easily from part (15) of Lemma 4 that Γ1 = Op(1/n). Since by (37), Γ1 =
Rq-TH^, we now have Rq-rrH = Op(1/n). Thus:

Theorem 6. If there are r linear independent cointegrating vectors then the matrix H of
standardized eigenvectors corresponding to the r smallest eigenvalues of the generalized
eigenvalue problem
(36) (with m chosen from Table 1 ) satisfies Rq-τTH = Op(1/n), where Rq-r
is the matrix of eigenvectors of C
(1)C(1)T corresponding to the positive eigenvalues.

22



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