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Elevating Data Visualization: Best Practices for Effective Graphs and Analyses

In the quest for clear communication of complex data, Gary McClelland and Julie Schiro present key insights on crafting effective visualizations. They explore the pitfalls of 3D charts, the significance of contrast, and the importance of engaging scatterplots. By focusing on clarity, they stress that if decision-makers can't interpret the graphs, the fault lies in the presentation, not the audience. This talk, inspired by historical figures like Florence Nightingale and John Snow, aims to empower statisticians to make impactful and accessible graphics for better data storytelling.

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Elevating Data Visualization: Best Practices for Effective Graphs and Analyses

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  1. Don’t Hide Good Data Analyses in Difficult Graphs Gary McClelland & Julie Schiro Analyze Boulder 4 June 2014

  2. Florence Nightingale “The Passionate Statistician” gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  3. John Snow gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  4. Charles Minard gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  5. gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  6. 3D Column Chart gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  7. “Height of Green Columns” gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  8. Blue > Green gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  9. Both Answers Correct? gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  10. Green Columns = 5 gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  11. Same data in 2D gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  12. But even here… Low contrast where discrimination needed High contrast where not needed gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  13. Scatterplots from R gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  14. However DOTS gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  15. What is the Relationship? gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  16. Neither helpful nor hurtful Not at all worth it Very worth it gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  17. Identical graphs, except the red cluster appears in the lower left or upper right gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  18. Without red clusters - identical gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  19. With “red” clusters gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  20. Regression Line Helps gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  21. Punchlines • “It’s not you, it’s me”: If the decision maker can’t understand your graph, don’t blame the decision maker. Make a better graph. • Unless there really is a 3rd dimension that you really need to display, avoid 3D graphs. • Enhance scatterplots and other graphics from stat programs to help the viewer focus on all of the data, not just some of it. gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  22. May you make great graphs! Thank you! Gary & Julie gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

  23. Useful Links & Addresses • Gary.mcclelland@colorado.edu • Julie.schiro@colorado.edu • Gary’s ground-breaking but now aging online interactive statistics textbook using Java applets: http://www.seeingstatistics.com • Gary’s data analysis textbook: http://www.dataanalysisbook.com • Gary’s data visualization consulting firm: http://www.bolderstats.com • Java applets for teaching statistical concepts: http://www.seeingstatistics.com/gallery/ [the magic words are ‘model’ and ‘error’] • Steven Johnson’s TED talk about John Snow’s “ghost map”: http://www.ted.com/talks/steven_johnson_tours_the_ghost_map.html • Michael Friendly’s data visualization website, the “Milestones Project” describes and illustrates the ‘Golden Age of Data Graphics’: http://www.datavis.ca • Edward Tufte is usually considered the guru of modern data graphics. His website has LOTs of resources: http://www.edwardtufte.com/tufte/ • This presentation: http://www.bolderstats.com/graphsAB.pptx gary.mcclelland@colorado.edu & julie.schiro@colorado.edu

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