Dear sir/madam,
In JMP17 I have made a design starting from 8 2-level factors, of which 5 are hard-to-change. For the hard-to-change factors only main effects are considered, for the easy-to-change factors 2nd order interactions are also evaluated.
Using Custom Design, 32 runs were generated, consisting of 8 whole plots.
Now, every run represents an adhesive formulation I would like to test on a series of different substrates (hard wood, plywood, …)
Unfortunately, for a limited number of substrates I do not have enough material to perform 32 tests. For those substrates I do not have many of, I would like to test them on a reduced number of runs (or adhesive formulations)
My question is, how can I best select a reduced number of runs? My initial idea was to drop one easy-to-change factor combination per whole plot, reducing the number of runs from 32 to 24. But still, how to choose which easy-to-change factor combinations to remove and which I should better retain?
Thank you in advance for any assistance,
Best regards,
