04.01.2013 Views

Springer - Read

Springer - Read

Springer - Read

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

244 Chapter 7 Multivariate Time Series<br />

7.4.1 The Covariance Matrix Function of a Causal ARMA Process<br />

From (7.2.13) we can express the covariance matrix Ɣ(h) E(Xt+hX ′ t ) of the causal<br />

process (7.4.6) as<br />

Ɣ(h) <br />

∞<br />

j0<br />

h+j| ′<br />

j , h 0, ±1,..., (7.4.12)<br />

where the matrices j are found from (7.4.8) and j : 0 for j

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!