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Übung zur Vorlesung
Informationsvisualisierung
Emanuel von Zezschwitz
Ludwig-Maximilians-Universität München Wintersemester 2014/2015
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Organisatorisches
• Informationen zu Vorlesung & Übung http://www.medien.ifi.lmu.de/lehre/ws1415/iv/
• Anmeldung über Uniworx: https://uniworx.ifi.lmu.de/?action=uniworxCourseWelcome&id=311
• Phase 1: Übungsblätter - Verständnis- und
Klausuraufgaben (freiwillig) • Phase 2: Projekt (freiwillig, 5%-10% Klausurbonus)
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Weitere Informationen
• Informatiker Forum http://www.die-informatiker.net/
• Mimuc Twitter Account (inoffiziell) http://twitter.com/mimuc
• Medieninformatik LMU Facebook Gruppe (inoffiziell) https://www.facebook.com/groups/36775131102/
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Einbringung ins Studium
• Master – Modul: WP16: Computergrafik 3 (für Master
Medieninformatik) – ECTS-Credits: 6 – Note: Teilnahme an Klausur
• Diplom
– SWS: 2 (Vorlesung) + 2 (Übung) – MM-Säule (Butz) – Note: Teilnahme an Klausur
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Klausur
• Termin: 03.02.2015, 10:00-12:00 Uhr Ort: Geschwister-Scholl-Platz 1, Raum B 101
• Closed Book • Klausurvorbereitung in den Übungen in der
Woche vor der Klausur
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“Graphical excellence is that which gives to the viewer the greatest number of ideas in the shortest time with the least ink in the smallest space.“
Edward Tufte [1]
Visualization © http://philip.greenspun.com/
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InfoVis Reference Model
Card et al. 1999
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“The representation of numbers, as physically measured on the surface of the graphic itself, should be directly proportional to the quantities represented.“
Edward Tufte [1]
Lie Factor
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Lie Factor
Lie Factor = size of effect shown in graphic
size of effect in data
size of effect = |second value – first value|
first value
should be close to 1
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Lie Factor
9.00%
10.00%
11.00%
12.00%
13.00%
14.00%
15.00%
16.00%
MMI1 Infovis
amount of students sleeping during lectures
Lie Factor = 5 0.5
= 10
size of effect in graph
|6– 1| 1
= 5
size of effect in data
|15– 10| 10
= 0.5
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Lie Factor
Lie Factor = 7.83 0.53
= 14,8
size of effect in data
|27.5– 18| 18
= 0.53
size of effect in graph
|5.3– 0.6| 0.6
= 7.83
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Lie Factor?
by Nigel Holmes [2]
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Data-Ink Ratio “A large share of ink on a graphic should present data-information, the ink changing as the data change. Data-ink is the non-erasable core of a graphic, the non-redundant ink arranged in response to variation in the numbers represented.“
Edward Tufte [1]
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Data-Ink Ratio
Data-ink ratio = Data-ink
Total ink used in the graphic
should be close to 1
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5 Data-Ink Principles by Tufte
1. above all else show data 2. maximize data-ink ratio 3. erase non-data-ink 4. erase redundant data-ink 5. revise and edit
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Data-Ink Ratio
0
2
4
6
8
10
12
A B C D
Is this data-ink?
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Data-Ink Ratio
0
2
4
6
8
10
12
A B C D
possible Tufte version
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Data-Ink Ratio
0
2
4
6
8
10
12
A B C D
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Data-Ink Ratio
0
2
4
6
8
10
12
A B C D
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Chartjunk “Chartjunk promoters imagine that numbers and details are boring, dull, and tedious, requiring ornament to enliven. If the numbers are boring, then you've got the wrong numbers.“
Edward Tufte [1]
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Chartjunk – Different Opinions “A good approach to information graphics includes an appeal to the reader, immediately followed by a true account of the story… I want to make room for enjoyment, delight, aesthetic appreciation and wit, and a friendly “you can understand this” approach.“
Nigel Holmes [2]
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Chartjunk
Bateman et al. [2]
Nigel Holmes [2] vs Edward Tufte [1] (Design) (Minimalist)
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Chartjunk – Pros and Cons Nigel Holmes vs Edward Tufte
• can contain a message • aesthetical • better memorable • …
Communicating data
• objective • clear • fast to perceive • …
Data analysis
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Preattentive Perception 200 – 250 ms
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Color pops out
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Shape pops out
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Flicker pops out
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Conjunction does not pop out
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Design and preattentive perception?
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Examples Wealth distribution in the UK
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© mvisr
Examples Movie Visualization
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© crime.mapatl.com
Examples Crime in Atlanta
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© http://www.thespeakersgroup.com/blog/obama-romney-2012-convention-speech-word-clouds/
Examples Obama versus Romney
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© http://www.thespeakersgroup.com/blog/obama-romney-2012-convention-speech-word-clouds/
Examples Obama versus Romney
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Visualization and Perception
© Spiegel online
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Visualization and Perception
© Spiegel online
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Visualization and Perception
© http://well-formed-data.net/archives/669/on-the-role-of-bacon-in-visualization
used color palette
desaturated
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Visualization and Perception
as perceived by a red-green color blind (http://www.etre.com/tools/colourblindsimulator/)
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Change Blindness
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Example
© http://www.csc.ncsu.edu/faculty/healey/PP/index.html
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Example
© http://www.csc.ncsu.edu/faculty/healey/PP/index.html
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Theories • Overwriting?
• First Impression?
• Nothing is Stored?
• Everything is Stored, Nothing is Compared?
• Feature Combination?
Further Reading: http://www.csc.ncsu.edu/faculty/healey/PP/index.html
© http://www.csc.ncsu.edu/faculty/healey/PP/index.html
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Referenzen
1. Edward Tufte. The Visual Display of Quantitative Information. Second Edition, Graphics Press, USA, 1991.
2. Nigel Holmes. Designer’s Guide to Creating Charts and Diagrams, Watson-Guptill Publications, 1984.
3. Scott Bateman, Regan L. Mandryk, Carl Gutwin, Aaron Genest, David McDine, and Christopher Brooks. 2010. Useful junk? the effects of visual embellishment on comprehension and memorability of charts. In Proc. CHI 2010.