Ordering in facet wrapped boxplots

[MalteLehmann]

Hey,

probably this has been posted hundreds of times, however none of the solutions seem to work. I am trying to reorder the plots in a facet wrapped boxplot to not have them in an alphabetical, but in a senseful order. I understood I need to use factor() for this. Just whereever I put it, it just doesn't work. Can anybody just tell me where exactly to put it?

My code is:
p <- ggplot(Rfilefinal3, aes(x=Cohort, y=Value)) +
geom_boxplot()
Rfilefinal3$Cohort <- factor (Rfilefinal3$Cohort, levels = c("Control", "Covid-19", "Celiac disease"))
p + facet_wrap( ~ Marker, scales="free", ) +
stat_compare_means(method = "wilcox.test", ref.group = "Control", label = "p.signif", hide.ns =TRUE)

[nirgrahamuk]

Hi!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…