Thanks to him for accepting sharing his work here! Thanks also to Tomás Capretto who split the original code into this step-by-step guide!
Let’s start by loading the packages needed to build the figure. ggstatsplot is the showcased package today.
ggstatsplot is an extension of ggplot2 package for creating graphics with details from statistical tests included in the information-rich plots themselves.
library(ggstatsplot) library(palmerpenguins) library(tidyverse)
Today’s data were collected and made available by Dr. Kristen Gorman and the Palmer Station, Antarctica LTER, a member of the Long Term Ecological Research Network. This dataset was popularized by Allison Horst in her R package
palmerpenguins with the goal to offer an alternative to the iris dataset for data exploration and visualization.
data("penguins", package = "palmerpenguins")
The only data preparation step is to simply drop missing values.
Today’s chart is going to show the distribution of Bill length for the three species of penguins in the dataset (Adelie, Chinstrap, and Gentoo). The function
ggbetweenstats in the
ggstatsplot is a great fit for this goal. Let’s see how it works.
<- ggbetweenstats( plt data = penguins, x = species, y = bill_length_mm )
It’s hard to find where the basic word fits in such a beautiful default plot, isn’t it?
ggstatsplot has very nice defaults that save a lot of time and work. But it can’t take over every single aspect of our charts. This is a good moment to add an appropriate title and labels with nice-looking styles.
<- plt + plt # Add labels and title labs( x = "Penguins Species", y = "Bill Length", title = "Distribution of bill length across penguins species" + ) # Customizations theme( # This is the new default font in the plot text = element_text(family = "Roboto", size = 8, color = "black"), plot.title = element_text( family = "Lobster Two", size = 20, face = "bold", color = "#2a475e" ),# Statistical annotations below the main title plot.subtitle = element_text( family = "Roboto", size = 15, face = "bold", color="#1b2838" ),plot.title.position = "plot", # slightly different from default axis.text = element_text(size = 10, color = "black"), axis.title = element_text(size = 12) )
The chart above is pretty close to being publication-ready. It only needs some final touches to the layout and it’s ready to go.
# 1. Remove axis ticks # 2. Change default color of the axis lines with a lighter one # 3. Remove most reference lines, only keep the major horizontal ones. # This reduces clutter, while keeping the reference for the variable # being compared. # 4. Set the panel and the background fill to the same light color. <- plt + plt theme( axis.ticks = element_blank(), axis.line = element_line(colour = "grey50"), panel.grid = element_line(color = "#b4aea9"), panel.grid.minor = element_blank(), panel.grid.major.x = element_blank(), panel.grid.major.y = element_line(linetype = "dashed"), panel.background = element_rect(fill = "#fbf9f4", color = "#fbf9f4"), plot.background = element_rect(fill = "#fbf9f4", color = "#fbf9f4") )
And finally, save the result. Check it out! Isn’t it wonderful?
ggsave( filename = here::here("img", "fromTheWeb", "web-violinplot-with-ggstatsplot.png"), plot = plt, width = 8, height = 8, device = "png" )