Fundamental chart types (part II)

A group of fuzzy round monsters with binoculars, backpacks and guide books looking up a graphs flying around with wings (like birders, but with exploratory data visualizations). Stylized text reads 'ggplot2: visual data exploration.' Learn more about ggplot2.

Pre-class Prep

A. Install required packages

install.packages("ggExtra") # {ggplot2} extension which can be used to add marginal histograms/boxplots/density plots to ggplot2 scatterplots
install.packages("ggdensity") # {ggplot2} extension providing more interpretable visualizations of density estimates based on highest density regions (HDRs)

B. Download `.qmd` templates & review data wrangling code

Download all necessary templates (links in the table below) and save them to a EDS-240-data-viz-examples/week4/ folder.
Review the data wrangling code under the ## Setup section of each template file and make note of any questions you might have. Due to time constraints, we won’t be live-coding our way through the data wrangling code in class. However, we’ll reserve some time to answer any questions before we jump into data viz .

Lecture Materials

Lecture slides	Code-along template	Code-along key
Lecture 4.1: visualizing amounts / rankings	4.1 template	4.1 key
Lecture 4.2: visualizing numeric relationships	4.2 template	4.2 key

Pre-discussion Prep

A. Prepare a `week4-discussion.qmd` file

Add a new blank file to your class repo at the following location: EDS-240-class-examples/week4/week4-discussion.qmd. Fill out the necessary YAML information (title, author, date + any other information you find helpful).

Discussion Materials

Discussion Slides	Exercise instructions	Exercise solutions
D4 slides: ggplot themes	D4 exercise: USDM plot theme	D4 solution

Assignment Reminders

Assignment Type	Assignment Title	Date Assigned	Date Due
HW	Homework #2	Wed 01/21/2026	Wed 01/28/2026, 11:59pm PT
FPM	Final Project Milestone #2	Wed 01/28/2026	Wed 02/04/2026, 11:59pm PT