How To Make Half Violinplot with ggplot2 in R?

Half Violin plots are basically used to visualize the distribution and the overall summary of the data at the same time. They are also known as Raincloud plots. A combination of half violin plots with jittered points on top, boxplots and can be further enhanced by adding central measures of tendency, quartile ranges, etc. Using this plot we can acquire insights about the density, key summary statistics, and overall range of the data.

Install and Load the required packages

Let's install and load ggplot2 and see packages.

install.packages("ggplot2")
install.packages("see")

library(ggplot2)
library(see)

Load the dataset

Let's load an in-built dataset called diamonds.

df <- diamonds
head(df)

Output:

  carat cut       color clarity depth table price     x     y     z
  <dbl> <ord>     <ord> <ord>   <dbl> <dbl> <int> <dbl> <dbl> <dbl>
1  0.23 Ideal     E     SI2      61.5    55   326  3.95  3.98  2.43
2  0.21 Premium   E     SI1      59.8    61   326  3.89  3.84  2.31
3  0.23 Good      E     VS1      56.9    65   327  4.05  4.07  2.31
4  0.29 Premium   I     VS2      62.4    58   334  4.2   4.23  2.63
5  0.31 Good      J     SI2      63.3    58   335  4.34  4.35  2.75
6  0.24 Very Good J     VVS2     62.8    57   336  3.94  3.96  2.48

Example 1: Simple Half Violin plot

Let's plot a Half Violin plot for the cut vs x of diamonds dataset.

ggplot(df, aes(cut , x, fill = cut)) +
  geom_violinhalf() +
  theme(legend.position = "none")

Output:

Example 2: Horizontal Half Violin Plot

Let's check out to align the Half violin plot horizontally using the coord_flip() function.

ggplot(df, aes(cut, x, fill = cut)) +
  geom_violinhalf() +coord_flip() +
  theme(legend.position = "none")

Output:

Example 3: Horizontal Half Violin Plot with color filled by cut

Let's check out to plot a Half violin plot horizontally and fill color by column cut.

# Half violin plot with color
ggplot(df, aes(cut,x, color=cut)) +
geom_violinhalf() + coord_flip()+
theme(legend.position = "none")

Output:

Example 4: Horizontal Half Violin Plot with jittered data points by the side

Let's check out to plot a Half violin plot along with jittered points.

ggplot(df, aes(cut, x, fill = cut)) +
geom_violinhalf(position = position_nudge(x = .2, y = 0)) +
geom_jitter(alpha = 0.01, width = 0.15) +
theme(legend.position = "none")

Output: