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414 Appendix D An ITSM Tutorial<br />

Figure D-8<br />

Sample ACF of the residuals<br />

from AIRPASS.MOD.<br />

ACF<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 />

D.4.3 Testing for Randomness of the Residuals<br />

The option Statistics>Residual Analysis>Tests of Randomness carries out<br />

the six tests for randomness of the residuals described in Section 5.3.3.<br />

Example D.4.3 The residuals from our model for the logged, differenced, and mean-corrected series<br />

AIRPASS.TSM are checked by selecting the option indicated above and selecting<br />

Figure D-9<br />

Sample PACF of<br />

the residuals from<br />

AIRPASS.MOD.<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

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