Hi all,
I have run a Plackett-Burman foldover screening DOE using 9 continuous factors. I included 3 center points to detect curvature.
I am unsure if for the analysis of the data table I should run the 'Screening' script or use the fit model platform. If I use the fit model platform, should I only include the main effects to construct the model effects since a PB design only allows estimation of main effects? When doing this, I have a significant lack of fit test and the model it does not detect curvature. Whilst when I use the screening script the lack of fit test is non-significant and I see that for some factors, the relationship with the reponse is non-linear.
Thank you for your help.
Sara
