Confounded data identification

Question

Dear JMP Professionals,

I have a question regarding confounded data for RSM DoE. If I have a 4 factor optimization DoE with RSM, how can I identify, which factor effects are confounded with other effects. I know about the confounding matrix, buth How do I identify it when I have my final dataset collected an I analyze the data.

Thanks a lot for your help!!

Best

Simon

Mark_Bailey · Answer

I doubt that a design for RSM exhibits any confounding. There might be correlation among the estimates, in fact, that result is very likely. i assume that you experiment is in a JMP data table. With the table open, select DOE > Design Diagnostics > Evaluate Design. This action will get you back to the information about the design including the correlations.

P_Bartell · Answer

Confounding is not typically examined in analysis of data because no response data is needed to evaluate confounding. Confounding is determined in the design selection phase and construction phase. Without knowing the specific design you picked, and if you had incorporated other randomization restrictions such as blocking, and the design's resolution it's problematic determining effect confounding. Lastly, typically confounding only arises if there is some fractionation or other unusual design altering that isn't a full factorial pathway going on within the overall design. For example, a 2**(4-1) fractional factorial portion of a central composite design will have confounding present. All of these issues can be explored in the Evaluate Design platform.

Perhaps if you share the specific design, and you can anonymize the factor names if need be, we can help?