Violin plot not working as expected

问题:

I am trying to generate a violin plot for a given dataset. The data varies from 0 to 100. But the violin plot goes over 100 and goes below 0.

How can I limit it between 0 to 100?

Code Used:

library(ggplot2)

input_data <- read.csv("C:/Temp/Recall.csv")
input_data
precision_in_percentage <- input_data$ResultValue



# Basic violin plot
p <- ggplot(input_data, aes(x='TRAssociation', y=precision_in_percentage)) +
  geom_violin(trim=FALSE) + geom_violin(trim=FALSE, fill='#A4A4A4', color="darkred")+
  geom_boxplot(width=0.05) + theme_minimal()

p

Violin Plot:

回答1:

Checking the documentation for geom_violin(), it looks like you should remove the trim=False specification. By default, ggplot2 sets trim = True.

From ggplot2 docs:

trim: If TRUE (default), trim the tails of the violins to the range of the data. If FALSE, don't trim the tails.

Note that if you like the shape of the geom_violin() and just want to restrict the y-axis boundaries, you can do that by adding + ylim(0, 100) to your plotting function calls.

Also, note that there is a boxplot tool that plays better with violin plots available via the stat_summary() function. Try removing your call to geom_boxplot() and instead using this (you may want to play with the shape and size parameters:

+ stat_summary(fun.y=median, geom="point", fill="white", shape=21, size=2.5)

回答2:

Documentation for that function can be found here. It looks like trim=TRUE might be used for this.

If TRUE (default), trim the tails of the violins to the range of the data. If FALSE, don't trim the tails.

Hope this helps!