How to resolve following situation?
1. i find the model-significant; lack of fit-non significant; but curvature-significant.
problem, is that how to assess the curvature. (design already has enough center points); should we go for CCD?
the results are pretty much fine...is there a way to build argument to conclude the model without exploring the curvature part?
2. i find 4 factors of 'equal effect', but their quantum of effect is not significant; You can imagine them to be a tower one of over other on the half normal plot...how to handle them....
1. i find the model-significant; lack of fit-non significant; but curvature-significant.
problem, is that how to assess the curvature. (design already has enough center points); should we go for CCD?
the results are pretty much fine...is there a way to build argument to conclude the model without exploring the curvature part?
2. i find 4 factors of 'equal effect', but their quantum of effect is not significant; You can imagine them to be a tower one of over other on the half normal plot...how to handle them....