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DATAVISUALSChristopher J. Brown
@bluecology
www.seascapemodels.org/dataviz
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Sophisticated dataviz
Source: www.cifar.ca
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Mean = 0.5SD = 2.7
Summary statistics
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Data: github.com/stephlocke/datasauRus
All these datasets have the same mean, SD and correlation.
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Source: sciencebasedmedicine.org
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Structure of this talk
1. Tools for dataviz2. Eleven principles for effective dataviz3. Repeat classic dataviz experiment4. Breaking the rules5. R the integrator
R code at www.seascapemodels.org
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Tools for constructing dataviz
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The ideal dataviz tool
•Sensible and clean defaults• Fast and convenient production of common graphics•Convenient to plot statistical models• Flexible enough to realize our creative thoughts
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The ideal dataviz tool?
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Photo: Rowan Trebilco
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R and the Intergovernmental Panel on Climate Change
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Data entry + merging
Maps
Graphs
Word processing
Analysis
Integrating tools
Interactive web content
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Data entry
Data mergingMapsGraphsAnalysis
Word processing
+
Integrating tools
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R is a flexible tool
• Flexibility is also it’s weakness•Hard to start•So many options to do the same thing•Steep learning curve•Often combine with other tools, e.g. Adobe Illustrator, Libre office (free), Gimp (free)
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When should I use ggplot2 or base R?
Simple charts Complex charts
Use base R
Use ggplot2
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Eleven principles for effective dataviz
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1. Plot your data
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2. Clarity not Simplicity
Image: Google Earth
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2. Clarity not Simplicity
Figure: Mann et al. Geophys Research Letters
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3. Dataviz are models of your interpretation
“Any visualization is a model”
Alberto Cairo 2016
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Your own vision is a model
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3. Dataviz are models of your interpretation
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3. Dataviz are models of your interpretation
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3. Dataviz are models of your interpretation
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3. Dataviz are models of your interpretation
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p < 0.001 for both
4. Visualise your models
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4. “Superplots”
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5. Length is most accurate for comparisons
Cleveland and McGill Science 1985
Length - aligned
Length
Angles
Area
Hue
Intensity
Accurate
Generic
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Length is easier than volume or area
Length is easier than volume
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Volumes are hard
Image: KeepCup
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Length is better than angles and area
Mariani et al. 2015 Frontiers in E & E
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While we’re on the topic of maps…
Brown et al. some time ago
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Length is better!
Cawthorn, Baillie and Mariani 2018
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6. Scaling matters
Compare these:
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Source: viz.wtf
6. Scaling matters
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6. Scaling matters
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7. Choosing units
Source: vaccinationcouncil.org
Dea
ths pe
r 100
,000
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Source: sciencebasedmedicine.org
7. Choosing units
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8. Less ink is more: Dataviz from excel 2003
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Less ink looks cleaner, less distracting
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Minimal ink
-0.5
0.0
0.5
-2 -1 0 1 2x
y
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9. Choose colours for more than just their looks
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Colour scales
Cinner et al. 2016 Nature
Colour bar makes the yellow (5.8) look specialNot visible to red‐green colour blind
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Colour scales
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Effective use of colour scales
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Colour scales: colorbrewer.org
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10. >7 elements is hard to interpret
Source: huffingtonpost.com.au
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Source: sciencebasedmedicine.org
11.Good data are easy to visualise
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Quiz
To find the quiz use your device to navigate to:
www.seascapemodels.org/dataviz
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Breaking the rules
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When a pie chart makes sense
Source: choosemyplate.gov
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Sophistication helps when: Details matter
Source: Dalin et al. 2017 Nature
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Being sophisticated is learning new skills
Source: Dalin et al. 2017 Nature
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R the integrator
@bluecology www.seascapemodels.org/dataviz
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Total number of people in the shopping centre
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Change the world
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The “hockey stick”
• Speaks to scientists and public
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Vaccinations
Source: The Wall Street Journal
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Get inspired
•The Truthful Art by Alberto Cairo•datavizcatalogue.com•Books by Tufte•Twitter: #dataviz•WTF Visualizations: http://viz.wtf, Twitter: @WTFViz•R code on my webpage: www.seascapemodels.org•Take our next R course at UQ (Feb 2019)
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Conclusion
•Aim for clarity, not simplicity or sophistication•Experiment to find the best way to view your data•Dataviz are models that aid interpretation•R can help you experiment with different models