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Figure D-4<br />

The sample ACF<br />

of the transformed<br />

AIRPASS.TSM series.<br />

Figure D-5<br />

The sample PACF<br />

of the transformed<br />

AIRPASS.TSM series.<br />

D.3 Finding a Model for Your Data 405<br />

ACF<br />

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

PACF<br />

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

0 10 20<br />

Lag<br />

30 40<br />

Preliminary Estimation dialog box. If no model is entered or estimated, ITSM<br />

assumes the default ARMA(0,0), or white noise, model<br />

Xt Zt,<br />

where {Zt} is an uncorrelated sequence of random variables with mean zero and<br />

variance 1.<br />

0 10 20<br />

Lag<br />

30 40

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