Hello everyone, i am inexperienced to use design expert program. Now, i am using central composite design for optimization. i want to see the quadratic effect but it is linear according to my results. In this situation, what shoud i do? and How can i explain a linear effect?
Thanks for your helps.
First of all your question is not clear.
are you asking why your quadratic terms are not significant in the results of ANOVA and how to explain the significant linear parameters in your model??
I do not know your experiment, but i know that if a curvature was not introduced by the factors considered in the experiment, there is no way the quadratic effects would be significant. If you also adopted the central composite design, quadratic models are best suited to fit the regression model(s) and so would be significant. If the quadratic effect is not significant like you said, it means there might be a problem in your choice of design. probably a linear design would have sufficed. So i suggest you look again at your experiment, design and then the responses. Please see the links below.Article Response surface modeling and optimization of major medium v...
Article Utilization of response surface methodology to optimize the ...
Thank you so much. I understood better thanks to you. I'll read these articles. Yours sincerely.
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