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slemoult1
slemoult1
Level II

Best design for a DOE with 3 variables and one 4 level categorical

Mar 5, 2020 08:17 AM (5361 views)

dear all

I am looking to find the best design with the following: 3 variables and 4 level categoricals. I have for now a custom design RSM with 28 sets. is there anything better?

Ideally I would like to reduce it to 15 sets.

Many Thanks in advance

Kind regards

Stephanie

 

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10 REPLIES 10
statman
Super User statman
Super User

Re: Best design for a DOE with 3 variables and one 4 level categorical

Mar 5, 2020 11:06 AM (682 views)  |  Posted in reply to message from statman 03-05-2020

Perhaps beyond the scope of your question, but the factors that affect design selection are:

  • Constraints: Time, money, measurement capability, etc. How many treatments can be made?
  • How many factors are to be manipulated (the number of hypotheses to be compared)?
  • How will noise be managed or partitioned?
  • Are some factors harder to change than others?  Are there other restrictions on randomization?
  • Are interactions (or other higher order effects) suspected/predicted?
    • What is the desired resolution? (What effects do you want to estimate/separate?)
"All models are wrong, some are useful" G.E.P. Box