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I'm baffled as to why the boxplots are not ordering in this plot:
set.seed(200)
x <- data.frame(country=c(rep('UK', 10),
rep("USA", 10),
rep("Ireland", 5)),
wing=c(rnorm(25)))
ggplot(x, aes(reorder(country, wing, median), wing)) + geom_boxplot()
How can I order the boxplots based on highest-lowest medians (left to right)?
756
One way to change the level order is to use factor() on the factor and specify the order directly. In this example, the function ordered() could be used instead of factor() . Another way to change the order is to use relevel() to make a particular level first in the list.
You can use the following syntax to change the order of the items in a ggplot2 legend: scale_fill_discrete(breaks=c('item4', 'item2', 'item1', 'item3', ...)
To reorder the boxplot we will use reorder() function of ggplot2. By default, ggplot2 orders the groups in alphabetical order.
Because you did not make it an ordered factor. Try
ggplot(x, aes(reorder(country, wing, median, order=TRUE), wing)) + geom_boxplot()
85
Your code should works fine. Probably you had some package loaded with a function that masked the base reorder function, or perhaps a user-defined reorder function, that doesn't work the same way.
You can check for such name-clashes with conflicts(). Detaching the package, rm(reorder), or restarting R and trying again without defining/attaching the conflicting definition will solve the problem.
39
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