[R-sig-ME] how to group x-axis levels with ggplot()

Luca Danieli mr@luced@n @ending from hotm@il@it
Mon Sep 10 15:03:44 CEST 2018

Hello everybody,

I have tried to solve this issue by posting a question on StackOverflow, but got no responses:

Basically, I have a plot (ggplot) of my lmer() model that presents on the x axis 8 levels. As my contrast splits these 8 levels in two groups (1 and 2 together, contrasted to 3,4,5,6,7,8 altogether), I would like to plot the results by grouping the 8 levels of the x axis into the two groups of the contrast hypothesis.

So, instead of:

| val  val  val  val  val  val  val  val
|-1----2---3----4---5----6----7---8  ----------> x axis

to have

| val                   val
|-front (1+2)---back+sides (3+4+5+6+7+8) -------------> x axis

Is it possible to do such a thing?
In case it was not possible to plot by grouping the x-axis levels through the ggplot() function, would it be the same if I grouped the levels before analyzing the model, in order to plot it as wished?


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