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Apr 13, 2021 at 16:38 comment added Tanner Phillips I agree with mdewey. A random effect is useful with a lot of levels because having 10 different binary variables is unrealistic. But with only three levels, a fixed effect only takes two binaries. Definitely don't do both though! If you're reviewer is being difficult and you can't find a good citation to refute this, I'd whip up a quick simulation study to show why a fixed effect is a better choice. I recall seeing something to this effect is Faraway' "Extending the linear model with R" if you're willing to search for it.
Apr 13, 2021 at 16:01 comment added mdewey With only three classes I would just use it as a fixed effect.
Apr 13, 2021 at 15:43 review First posts
Apr 13, 2021 at 16:01
Apr 13, 2021 at 15:37 history asked Peter CC BY-SA 4.0