Dear Nuraimi,
Here Are links and attached files in subject.
-Multiple Regression Analysis and Response Optimization Examples ...
blog.minitab.com/.../multiple-regression-analysis-and-response-opt...
-Lesson 11: Response Surface Methods and Designs | STAT 503
https://onlinecourses.science.psu.edu/stat503/node/57
-Comparison of process parameter optimization using different designs ...
www.ncbi.nlm.nih.gov › ... › Literature › PubMed Central (PMC)
Best regards
thanks @Lafifi
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