How to Make a Scatter Plot Matrix in R

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DataDaft

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Published on November 4, 2019 5:15:49 PM ● Video Link: https://www.youtube.com/watch?v=AY9PYzJtCNA

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Guide

Duration: 3:18

21,292 views

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Scatter plot matrix is a plot that generates a grid of pairwise scatter plots for multiple numeric variables. Creating a scatter plot matrix can be a useful way to visually explore relationships between several numeric variables quickly.

Code used in this code clip:

library(tidyverse)
library(GGally)

data ＜- mtcars

# Scatter plot matrix in base R
pairs(~ mpg + hp + cyl + wt, data = data,
lower.panel = panel.smooth)

# Scatter plot matrix with GGally
data %＞% ggpairs(columns = c("mpg", "hp", "cyl", "wt"),
upper = list(continuous = wrap('cor', size = 8)))

# Scatter plot matrix with GGally, coloring by cyl
data %＞% mutate(cyl = factor(cyl)) %＞%
ggpairs(columns = c("mpg", "hp", "wt", "cyl"),
aes(color = cyl),
upper = list(continuous = wrap('cor', size = 5)),
lower = list(combo = wrap("facethist", bins = 30)),
diag = list(continuous = wrap("densityDiag", alpha = 0.5)))



Code Clips are basic code explanations in 3 minutes or less. They are intended to be short reference guides that provide quick breakdowns and copy/paste access to code needed to accomplish common data science tasks. Think Stack Overflow with a video explanation.


* Note: YouTube does not allow greater than or less than symbols in the text description, so the code above may not be exactly the same as the code shown in the video! For R that means I may use = for assignment and the special Unicode large ＜ and ＞ symbols in place of the standard sized ones for dplyr pipes and comparisons. These special symbols should work as expected for R code on Windows, but may need to be replaced with standard greater than and less than symbols for other operating systems.