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Old 10th October 2012, 07:12 AM
Miner's Avatar

Total Posts: 4,372
Look! re: Design of Experiments - DOE with Centre Point

Welcome to the cove Renzoquim,

Good first post. I want to clarify a few points in your comment. Center points do not really estimate the curvature because this implies that they can estimate the magnitude of the curvature. They can detect the presence of curvature, but cannot determine which factor(s) are responsible.

Regarding the number of center points, the guidance I typically give is to use 2-3 center points per block to detect curvature, or 5-7 center points to detect curvature and estimate pure error.

If the center point is not significant, remove them from the model.
Thanks to Miner for your informative Post and/or Attachment!

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