Rajesh,Prior to using any optimality function you should perform a model reduction using the ANOVA table that resulted from the initial DOE analysis. This ANOVA table should include interactions, and allow you to determine which effects, main and interaction are significant. Concerning the attribute response data. Consider doing an intial piecewise analysis to see which inputs affect each response. If your lucky, both responses will be affected by similar inputs. If not, you will need to evaluate the effect on the response of changing non-significant inputs for example the continuous response vs. significant inputs for the attribute response.Good luck,Ken
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