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Figure 7-3<br />

The sample ACF ˆρ22 of the<br />

observed values of {Xt2} in<br />

Example 7.1.1, showing<br />

the bounds ±1.96n −1/2 .<br />

Figure 7-4<br />

The sample correlations<br />

ˆρij(h) between Xt+h,i and Xt,j<br />

for Example 7.1.1. (ρij(h)<br />

is plotted as the jth graph<br />

in the ith row, i, j 1, 2.<br />

Series 1 and 2 consist of<br />

the daily Dow Jones and<br />

All Ordinaries percentage<br />

returns, respectively.)<br />

7.1 Examples 227<br />

ACF<br />

-0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0<br />

0 10 20 30 40<br />

Lag

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