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Design of Experiments - US Army Conference on Applied Statistics

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• Aliases:<br />

The 2 4-1<br />

– All main effects are clear <str<strong>on</strong>g>of</str<strong>on</strong>g> the two-factor interacti<strong>on</strong>s<br />

– two-factor interacti<strong>on</strong>s may be c<strong>on</strong>founded with each other<br />

• Orthog<strong>on</strong>al<br />

• Makes interpretati<strong>on</strong> easy – if there are no active interacti<strong>on</strong>s<br />

• Minimizes the variance <str<strong>on</strong>g>of</str<strong>on</strong>g> the model coefficients<br />

• Minimizes the average predicti<strong>on</strong> variance<br />

• Minimizes the maximum predicti<strong>on</strong> variance<br />

• Once again, you can’t do any better than this!

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