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Analysis of Plackett-Burman design

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

Design of ExperimentsRe: Analysis of Plackett-Burman design

I also do not understand why this Screening script appears for this PB design while it was not present for a main effects screening design that I performed a few months ago.