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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 />

• What about a <strong>on</strong>e-half fracti<strong>on</strong>?<br />

– 120 runs<br />

– Not orthog<strong>on</strong>al, but very close<br />

• What about a <strong>on</strong>e-quarter fracti<strong>on</strong>?<br />

– 60 runs<br />

– Not orthog<strong>on</strong>al, but close<br />

• The 30 run design isn’t orthog<strong>on</strong>al, but it’s close<br />

• We <strong>on</strong>ly need 11 degrees <str<strong>on</strong>g>of</str<strong>on</strong>g> freedom to estimate the main<br />

effects?<br />

• What can we do with 15 runs?

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