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7.1 Examples 225<br />

and a natural estimator of Ɣ(h) is<br />

⎧<br />

⎪⎨ n<br />

ˆƔ(h) <br />

⎪⎩<br />

−1<br />

n−h<br />

<br />

t1<br />

ˆƔ(−h) ′<br />

Xt+h − Xn<br />

<br />

Xt − Xn<br />

The correlation ρij (h) between Xt+h,i and Xt,j is estimated by<br />

ˆρij (h) ˆγij (h)( ˆγii(0) ˆγjj(0)) −1/2 .<br />

′<br />

for 0 ≤ h ≤ n − 1,<br />

for − n + 1 ≤ h

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