Graphics Best Practices Anna Jursik, Lester Shen, and Jenny Edwards, March 13, 2013 Lunch and Learn
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Graphics Best Practices
Anna Jursik, Lester Shen, and Jenny Edwards, March 13, 2013
Lunch and Learn
Lunch and Learn: Graphics Best Practices
General Principles
Page 3
Consider the audience
Page 4
Establish hierarchy
Page 5
Stick with established patterns
Page 6
Minimize “chartjunk”
Minimize “chartjunk”
Page 7
What is the “smallest effective difference”?
Find the smallest effective difference
Page 8
Account for a multivariate world
Page 9
Post hoc ergo propter hoc
Courtesy of Michael Blasnik
Lunch and Learn: Graphics Best Practices
Displaying Numbers
Page 11
Averages
+ Mean
+ Median
+ Mode
Page 12
Averages
Page 13
Averages
Page 14
Averages
Page 15
Significance
Page 16
Significance
Page 17
Consistent Scales
Page 18
Consistent Scales
Page 19
Consistent Scales
Page 20
Reading in City Schools – 2nd Grade
Page 21
Full axis
Page 22
Error bars
Page 23
Error bars
Page 24
Show Me the Data
Page 25
Show Me the Data
Chart Types, Color, and Formatting
Page 27
+ Line Chart: Show Trends
What type of chart to use?
What Type of Chart to Use?
Page 28
+ Column or Bar: Discrete Repeating Units
What type of chart to use?
What Type of Chart to Use?
Page 29
+ Pie Chart: Emphasize A single value, or extremes (Large or Small Values)
What type of chart to use?
What Type of Chart to Use?
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Better choice: Radial Treemap
Page 34
Legends are overused
Page 35
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Condos
Single Family
Peak at 172 Days
Page 37
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Use legends if space is tight
Make sure legend order reads in the same order as data, and use color to assist
Page 42
General Color and Format Rules:Don’t overuse: maintain smallest effective differenceUse color and formatting to group similar types, to
show scale or trendsReserve different formatting dimensions to highlight
what you care about
Page 43
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US Injuries + Fatalities per Billion Passenger-Miles(2002-2004)
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Portland’s Transportation Carbon Footprint
Page 47
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Color-Blind Considerations
Page 53
Use tick marks when you want to show discrete measurements
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Create a logical order
Page 58
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