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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 Case for N<strong>on</strong>-orthog<strong>on</strong>al <str<strong>on</strong>g>Design</str<strong>on</strong>g>s<br />

• Sometimes insisting <strong>on</strong> an orthog<strong>on</strong>al design is problematic<br />

• Suppose that we have five factors:<br />

– A is categorical at 5 levels<br />

– B is categorical at 4 levels<br />

– C is categorical at 3 levels<br />

– D & E are c<strong>on</strong>tinuous with 2 levels<br />

• A full factorial has 240 runs and is orthog<strong>on</strong>al<br />

• But would you really seriously c<strong>on</strong>sider running this<br />

experiment?

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