Radar Charts!
Sheena Ellenburg
Outline
• Overview– Characteristics– Nomenclature
• Usage• Examples
Overview - Characteristics
• 2-D• 3 or more quantitative variables represented
as axes starting from the same origin– Equi-angular spokes called radii– Lines drawn between points to form a polygon
• Relative position and angle of the axes generally not informative
Overview - Nomenclature
• Also known as:– Web chart, cobweb chart (gridlines)– Spider chart (gridlines)– Star plot (no gridlines)– Irregular polygon– Polar chart (angular significance)– Kiviat chart (acceptable range bands)– Stardinates (Lanzenberger, 2003)
Usage
• Ideal Data:– Multivariate (mas que 3)– Many Quantitative to One Nominal• Sports players attributes, companies, coffee beans
• Questions:– Which records/observations are most similar
(clustering)– Which records/observations are dissimilar• Are there outliers?
When to Use a Radar Chart
• If you can’t accommodate different quantitative scales in a bar graph
• If the objective if to compare symmetry rather than magnitudes– Stephen Few’s resort example
• Data fits circular display intuitively (counter/clockwise reading order is either explicitly obvious, or is unimportant)– Clocked data– Coffee bean taste attributes
Examples
Spider/Web/Cobweb Chart
Star Plot
Polar Chart
Kiviat Chart
“Stardinates”
[Lanzenberger, 2003]: Lanzenberger, M., "The Stardinates - Visualizing Highly Structured Data", Proceedings of the Seventh International Conference on
Information Visualization (IV'03), 2003.
Cupping Scores
• SCAA Cupping Protocols
• Sweet Marias Coffee Achives
How to Taste an Oyster
• Tomato - The insider's guide to food and drink in Melbourne
European Sensory Network: Sensory Profiles of three German beers
http://www.esn-network.com/635.html
More examples of food research
• http://www.cjbio.net/html/innovation/food_application.asp• http://www.sciencedirect.com/science/article/pii/S09503293
09000226
References
• Kiviat Diagram: www2.cs.uidaho.edu• Polar Chart: advsofteng.com• Spider chart, star plot: wikipedia.org• Stardinates: infovis-wiki.net• Verghisgroup.com – 3 Things to Think About – A
Warning Label for Radar Charts• Few, Stephen. Keep Radar Charts Below the Radar
– Far Below. 2005. Perceptual Edge.
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