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Designing an experiment with some consideretions

Discussion in 'DOE - Design of Experiments' started by Carlos Avila, Nov 14, 2019.

  1. Carlos Avila

    Carlos Avila New Member

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    Hi there!

    What would be the best approach for an only experiment with 4 factors?

    Acid
    Temperature
    Concentration
    Time

    The thing is that there are two important considerations in this experiment and its necesary some ideas to apporach the experiment correctly.

    1. There are three different acids and they wouldnt combine ever.
    2. One of them (Acid C) allows a higher temperature due to its boiling temperature.

    It looks something like this:

    Acid A
    Temperature: 10-20 ºC
    Concentration: 5-10 %
    Time: 15-30 min.

    Acid B
    Temperature: 10-20 ºC
    Concentration: 5-10 %
    Time: 15-30 min.

    Acid C
    Temperature: 10-50 ºC
    Concentration: 5-10 %
    Time: 15-30 min.


    Thank you very much in advance
     
  2. Miner

    Miner Moderator Staff Member

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    I changed the title because a 2^4 design restricts all factors to 2 levels. You can study this as a 24 run General Full Factorial experiment, which allows you to vary the number of levels per factor. While Acid C allows a higher temperature, is it necessary to use that higher temperature, or can you use 1-20 C for all three acids?
     
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  3. Carlos Avila

    Carlos Avila New Member

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    Thanks for your reply Miner!

    Yes, it's necessary, as I mentioned in the second consideration, it's important to use these levels to enrich the further research and studies, using in the case of Acid C the levels specified for temperature.

    So these considerations are importante to rethink how to study this experiment correctly, and choose the most appropriate type of design.

    Thank you very much in advance
     
  4. Miner

    Miner Moderator Staff Member

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    Ok. You can still use the General Full Factorial, but will have to supplement that by using "sliding levels", which means that the different levels are now nested within acid type. This will complicate the analysis, since you cannot use the standard ANOVA for the analysis. You can refer to this article for further guidance on the analysis.
     
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