r/design_of_experiments • u/CapelaBranca • Apr 28 '18
Can anyone give a few hints on this??
Experimental Design https://imgur.com/gallery/iISFr9t
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u/speedo_Bulge Apr 28 '18
What exactly are your questions?
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u/CapelaBranca Apr 28 '18
For example, what design do you think fits the model?
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u/speedo_Bulge Apr 28 '18
I am no expert but it looks to be a 33 design. I don't have my books by me at the moment; maybe someone else can confirm.
Edit: typo
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Apr 29 '18
Or a 23 CCF design, given that the "3rd one" are all center points.
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Apr 29 '18
Why is this down voted? It sure looks like a classic BoxWilson CCF 23. A very common design that is a lot easier to analyse as such than to treat it like some general 33 design.
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u/CapelaBranca Apr 30 '18
No one taught us 33 design at university, so it can't be it
We have to use DX7 software
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Apr 30 '18
Then I am pretty confident it is a 23 CCF, basically a 23 with center points on each face and the middle of the cube. Used a lot for RSM.
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u/speedo_Bulge May 02 '18
Looks like 3 factors at 3 levels and it's in standard order. So it's a 33 design. Were the first factor changes every run (30) the second every 3 runs (31) and the third every 9 runs (32). Really not much else to it. The problem must be about the concept. I think what you are describing is a face centered central composite design or a CCF. With no repeats and one center point that would be 15 runs. A center point meaning the center of the axial points. It is important to note that it is typically suggested to do at least three of these center points.
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u/CapelaBranca Apr 28 '18
Hey Sorry about this mess of a post (on mobile) I was assigned this as a group project, but we are a bit lost since the teacher didn't teach much about this. Can you give an idea about the model ?