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twoway interaction and quadratic effects cannot all be estimated simultaneously

Color Map on Correlations for Full Quadratic Model shows a Color Map on Correlations for the design with eight continuous factors shown in Definitive Screening Design for Eight Continuous Factors. The color map is for a full quadratic design. The eight pure quadratic effects are listed to the far right. You can construct this plot by using DOE > Design Diagnostics > Evaluate Design and entering the appropriate terms into the Alias Terms list. See Alias Terms in Evaluate Designs for details.
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