Can I add a factor to an existting DOE and/or change the values of any run in an existting DOE?
Hi, I developed a DOE model with 3 factors (one categorical) for a specific time (7 days) containing 16 runs. Later I used the same DOE but now for samples (runs) with a loger time (28 days). Now, I have decided to add the time as a factor but I want to keep the runs that a I have (16 runs for 7 days, and 16 runs for 28 days); to improve the quality of the model I decided to add center points to t...