I want to make a boxplot with the iris dataframe. The field Species is factor with 3 levels of setosa, versicolor and virginica. When I filter out setosa, it removes the boxplot from the graph but what I want is for setosa to still be there on the x axis. How can I do this?
library(tidyverse)
iris%>%
filter(Species!="setosa")%>%
ggplot(aes(x=Species, y=Sepal.Length,fill=Species)) +
geom_boxplot()
Add drop=FALSE to the x and/or fill scale and if you are using ggplot2 >= 3.5.0 additionally add show.legend=TRUE to geom_boxplot (otherwise the key symbol will not be shown in the fill legend):
library(tidyverse)
iris %>%
filter(Species != "setosa") %>%
ggplot(aes(x = Species, y = Sepal.Length, fill = Species)) +
geom_boxplot(show.legend = TRUE) +
scale_x_discrete(drop = FALSE) +
scale_fill_discrete(drop = FALSE)
