In design expert software(in RSM case) ,when is it necessary to add Propagation of Error (POE) to the optimization? what is its benefit for optimization process? how can i do that?
You need add a term (error term) in your objective function of optimization by multiplying it with a penalty factor. The error term should be the sum of square of all the errors. The penalty factor will be a positive number (say 100) if your objective is of minimization type.
The effects of error term addition in optimization will try to minimize all the errors of the system you are considering.