How to change order of boxplots when using ggplot2?

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Have you tried this:

df2$variable <- factor(df2$variable,
    levels = c('vph.shr','vnu.shr'),ordered = TRUE)

I just picked an ordering there, since my system is configured slightly differently than yours I suspect, so my ‘default ordering’ may differ. But you can just switch the position of levels when specifying them.

A few other options, depend on your tastes:

For just reversing the current ordering:

factor(df2$variable,levels = rev(levels(df2$variable)),ordered = TRUE)

or you can use subsetting to specify a specific ordering if you don’t want to type out each level by hand:

factor(df2$variable,levels = levels(df2$variable)[1:2],ordered = TRUE)

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