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BSindahl
Level I

DOE - Split Plot Designs: Does one ever include center points?

Greetings:  I'm new to split plot designs, understand the basic structure and application.  Does one ever include center points in such a design to detect curvature?  I've searched and searched, but haven't been able to find an answer.  I suspect the answer is "No", but if anyone out there can refer a document or has an answer, I'd love to know the reason.

 

Cheers, Bruce

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statman
Level VII

Re: DOE - Split Plot Designs: Does one ever include center points?

Bruce, there would be nothing wrong with adding center points to a split-plot design.  You should read "Split-plot designs for robust product experimentation", Box and Jones if you really want to take advantage of the capabilities of split-plot designs.  They are NOT just for hard-to-change factors.

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BSindahl
Level I

Re: DOE - Split Plot Designs: Does one ever include center points?

Awesome Statman, thanks for the info. I'll get the text.

Happy experimenting!

Bruce
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