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How do I combine 2 factors from a two-way ANOVA model into 1 factor in a one-way model? Do I take the factor with the most effect on the model, or consider both factors in? For example, if I used factor A and B in the 2-way model, let's say the response variable depends more on factor A, do I only include factor A in the 1-way model?

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You don't do this. That is, you don't "combine" the two factors. You may want to drop one, but that's a different question.

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  • $\begingroup$ So is it right I only include the one factor that has the most effect on the response variable? $\endgroup$
    – eunice
    Nov 14 '17 at 12:30
  • $\begingroup$ No. Or, at least, you haven't given us enough information. There can be reasons to drop a variable, but you could equally well just want to keep a two-way ANOVA. $\endgroup$
    – Peter Flom
    Nov 14 '17 at 12:31

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