Hello Miner
Thank you for your explanations and help!.
I am trying to learn how to do General Regression to see if I can get the same results that you did but, every time that I run it for Ressis. I get:
General Regression Analysis: Ressis. versus A, B, C
Regression Equation
Ressis. = 3.85333 - 0.002 A - 0.0375 B + 0.012 C
Which is very different to your results
General Regression Analysis: Ressis. versus A, B, C
Regression Equation
Ressis. = 0.00193632 A + 0.210163 B - 0.00385345 B*B + 0.000316726 C*C
For the Effic case it is also very different.
Evidently, I am doing something wrong.
Thank you again