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Design of Experiments - US Army Conference on Applied Statistics

Design of Experiments - US Army Conference on Applied Statistics

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The Model/<str<strong>on</strong>g>Design</str<strong>on</strong>g> Relati<strong>on</strong>ship – Aliasing<br />

Suppose the best polynomial approximating model is:<br />

But we estimate <strong>on</strong>ly 1 using least-squares:<br />

Now the elements <str<strong>on</strong>g>of</str<strong>on</strong>g> the least-squares estimates <str<strong>on</strong>g>of</str<strong>on</strong>g> 1<br />

are biased by 2 , that is:<br />

where the alias matrix, A, is:

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