R in 3 Months Week 11 (Advanced Data Viz, Part 2)

Agenda

1. Housekeeping

2. Advanced Custom Themes

3. Mapping

4. Interactive Data Viz

5. Next Week

https://rin3spring2026.rfortherestofus.com/slides/slides-week-11.html

Housekeeping

1. Two more weeks: Advanced Quarto and final projects

2. Final project is to record a video demonstrating something you’ve learned (lesson)

Please submit things!

Self-reflection

Please share in the chat:

1. What was one thing that you’ve found difficult this week?
   
2. What was one thing that you’ve learned this week?

Why is group = district needed?

ggplot(
  aes(
    x = year,
    y = pct,
    color = highlight_district,
    group = district
  )
) +
  geom_line()

A. To create one line per district
B. To color the lines
C. To remove missing values
D. To format percentages

Why is group = district needed?

ggplot(
  aes(
    x = year,
    y = pct,
    color = highlight_district,
    group = district
  )
) +
  geom_line()

A. To create one line per district
B. To color the lines
C. To remove missing values
D. To format percentages

Advanced Custom Themes

Organizations with Public Custom {ggplot2} Themes

• The BBC’s {bbplot} Package

• The BBC’s Cookbook for R Graphics

• Washington Soil Health Initiative {washi} Branding Package

Organizations with Public Custom {ggplot2} Themes, Continued

• Sage Bionetworks {sagethemes} Package

• Duke University’s {duke} Package

• University of Exeter’s theme_exeter()

https://book.rfortherestofus.com/themes.html

• Add hide_gridlines
• Add hide_legend

Mapping

https://book.rfortherestofus.com/maps.html

https://r.geocompx.org/

• geometry type
• dimensions
• bounding box
• crs
• geometry column

Check-in break

ggplot() +
  geom_sf(
    data = portland_boundaries,
    fill = "gray80"
  ) +
  geom_sf(
    data = traffic_signals,
    aes(color = software_type),
    size = 1
  )

1. Which layer will appear underneath the other?
2. What geometry type is traffic_signals likely using?
3. What will determine the color of the traffic signal points?

1. First layer (portland_boundaries) draws underneath.
2. traffic_signals is likely point geometry.
3. software_type controls color.

Interactive Data Viz

https://davidgohel.github.io/ggiraph/

Next Week

• Advanced Quarto

• Do the lessons relevant to you (chat with Gracielle if you’d like help identifying them) and skip the rest

• I’ll demonstrate parameterized reporting next week in the live session so feel free to skip those lessons for now

• Start to think about final project