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I wonder why a DoE/fractional factorial design isn't studied with the help of a linear mixed model? Or an Anova? How to analyze it in general is e.g. given here.

Background: I will study several gas sensors to select the "best" one. Best one means the one that provides the fastest reaction time, most clear and distinct signal and also shows the least influence from different gases.

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closed as unclear what you're asking by AdamO, Martijn Weterings, Michael Chernick, mkt, Peter Flom Sep 21 at 11:54

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Not studied with linear model or anova... It isn't? $\endgroup$ – Martijn Weterings Sep 20 at 13:10
  • $\begingroup$ mh, ok.. so DoE is "only" for planning the design? $\endgroup$ – Ben Sep 20 at 13:26
  • $\begingroup$ Voting to close as unclear because nowhere in the cited references does anything claim such an experiment can't analyzed with linear model (which is equivalent to ANOVA BTW). $\endgroup$ – AdamO Sep 20 at 13:40
  • $\begingroup$ a linear model is equivalent to anova? $\endgroup$ – Ben Sep 20 at 13:55
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    $\begingroup$ I am voting to close because you seem to have a lot of questions, which currently seem to be dumped all into one question. The people here are willing to answer all those questions but it is not the point of this website to become a chatbox for discussions. The point is that we wish to have clear (concise) questions and answers that will have also use in the future for people with the same questions. That means that the particular issues need to be well described and isolated for other people to be able to find them (contrary to find a way in a bewildered forest of questions). $\endgroup$ – Martijn Weterings Sep 20 at 14:52
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This is overly broad, for more useful answers tell us some context, or your intended application (with sufficient detail.) For your implied question in a comment, yes DoE (Design of Experiment) is about the planning, that is, actually to be done before you actually do the experiment. Linear mixed models are used if you have some random factors, for example, in a Taguchi designs these could be ambient factors that can be controlled in an experiment, but not in production.

So there is certainly the possibility to use mixed models for data obtained from designed experiments, but the need for that comes from the actual application, and not from the design.

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  • $\begingroup$ thanks a lot for clearing my questions. Which question would lead to mixed models? I updated my question. $\endgroup$ – Ben Sep 20 at 13:53

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