Problem in Minitab - ERROR * Factor Voltage is highly correlated with other terms
- Thread starter Om Redha
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thanks for reply me....I will attach my Minitab file in verision 17 , Ok???
The problem is in the design of the experiment, not in the analysis. Factors A and B are 100% aliased (confounded) with each other. This means that you cannot determine which of these factors may be responsible for an effect. And, as the error stated the design is not an orthogonal design, which means there is some degree of aliasing between factors.
Since you are using more than two experimental levels (3 & 5), you cannot use a 2^k factorial design, you must use a general full factorial experiment, which will require 135 experimental runs. I recommend a 2^4 design (attached). With center points this will require 19 runs. This design is orthogonal, and the addition of center points will allow you to see whether there may be curvature in the response. If there is curvature, you will be able to add axial points and expand this into a response surface design.
Since you are using more than two experimental levels (3 & 5), you cannot use a 2^k factorial design, you must use a general full factorial experiment, which will require 135 experimental runs. I recommend a 2^4 design (attached). With center points this will require 19 runs. This design is orthogonal, and the addition of center points will allow you to see whether there may be curvature in the response. If there is curvature, you will be able to add axial points and expand this into a response surface design.
Attachments
please, can you complete the solution and find analysis of variables (anova) because Iam student and I do not have experience in dealing with Minitab, please....
It's not that simple. Since the design structure is seriously flawed, the best that you will be able to do is perform a regression analysis instead of an ANOVA. Even then, too many of the factors are highly correlated with each other to trust any results. This experiment should be designed correctly and run again.
Well, can you do that? Can you complete the solution as you see fit and correct? I would be grateful for your efforts with me. There is no one to help me, even the supervisor does not know anything about Minitab. I am waiting for your reply
what do you mean ((The results will be pretty much meaningless))
A D are inputs (factors) and GRG, CO, TH, H and R are output(responses). what do you mean ((The results will be pretty much meaningless)). Do you mean that the results I sent you can't be solved by Mintab???? what I do??? I do not know???
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