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Related categorical variables, how to model in Minitab

Discussion in 'DOE - Design of Experiments' started by avidlearner, Mar 6, 2024.

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  1. avidlearner

    avidlearner New Member

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    Hello:

    I am running an experiment with four categorical variables. They all have two levels.
    My issues is that one of the variable will be active only when one of the another variable will have a specific level.
    Example, I have A, B, C and D variables.
    Each variable has two levels Yes and No.

    Variable D levels Yes and No are valid only when variable B is Yes.

    How can I model this DOE in Minitab.

    Your help is highly appreciated.
     
    avidlearner, Mar 6, 2024
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  2. Miner

    Miner Moderator Staff Member

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    For clarification. When variable B is No, is variable D:
    • Only Yes?
    • Only No?
    • Not feasible?
    Start by studying up on nested designs. There is definitely nesting involved here but not the typical type of nesting.
    You will probably have to create the design manually or by modifying a Minitab designed experiment then analyze it using General Linear Model (GLM), correctly specifying the nested structure.
     
    Miner, Mar 7, 2024
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  3. Bev D

    Bev D Moderator Staff Member

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    Agree with Miner on understanding nesting.
    we would need more specific details on the factors and levels to provide much more advice.

    You can - and should - run the experiment and simply plot your data in a 'variability chart'. you may not even need any mathematical statistical analysis. Graphing data is your friend. a resulting plot would look like what I have attached:
    upload_2024-3-7_8-18-58.png
     
    Bev D, Mar 7, 2024
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    Troels Forchhammer likes this.