Information Visualization Crash Course
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1 Information Visualization Crash Course (AKA Information Visualization 101) Chad Stolper Assistant Professor Southwestern University (graduated from Georgia Tech CS PhD) 1
2 What is Infovis? Why is it Important? Human Perception Chart Basics (If Time, Some Color Theory) The Shneiderman Mantra Where to Learn More 2
3 What is Information Visualization? 3
4 Information Visualization The use of computer-supported, interactive, visual representations of abstract data to amplify cognition. Card, Mackinlay, and Shneiderman
5 Communication Exploratory Data Analysis (EDA) 5
6 Communication (gone wrong) 6
7 7
8 Edward Tufte An American statistician and professor emeritus of political science, statistics, and computer science at Yale University. He is noted for his writings on information design and as a pioneer in the field of data visualization. -Wikipedia 8 X
9 Space Shuttle Challenger January 28, 1986 Morning Temperature: 31 F 9
10 10
11 Tufte, E. R. (2012). Visual explanations: images and quantities, evidence and narrative. Cheshire, CT: Graphics Press. 11
12 Most Watched Science Experiment Richard Feynman, Physics Nobel laureate explained how rubber became rigid in cold temperate YouTube video: Video originally from: 13
13 How did this happen? 14
14 Engineers at Morton Thiokol, the rocket maker, presented on the day before and recommended not to launch. Tufte, E. R. (2012). Visual explanations: images and quantities, evidence and narrative. Cheshire, CT: Graphics Press. 15
15 19
16 24
17 25
18 26
19 27
20 28
21 So, communication is extremely important. Visualization can help with that communicate ideas and insights. 29
22 30
23 Visualization can also help with Exploratory Data Analysis (EDA) But why do you need to explore data at all??? 31
24 There are three kinds of lies: lies, damned lies, and statistics. 33
25 Mystery Data Set 34
26 Mystery Data Set Property Value mean( x ) 9 variance ( x ) 11 mean( y ) 7.5 variance ( y ) correlation ( x,y ) Linear Regression Line y = x 35
27 36
28 37
29 38
30 39
31 Anscombe s Quartet 40
32 Anscombe s Quartet Sanity Checking Models Outlier Detection 41
33 Data visualization leverages human perception 43
34 Name the five senses. 44
35 Sense Bandwidth (bits/sec) Sight 10,000,000 Touch 1,000,000 Hearing 100,000 Smell 100,000 Taste 1,
36 A (Simple) Model of Human Visual Perception 46
37 A (Simple) Model of Human Perception Stage 1 Stage 2 Parallel detection of basic features into an iconic store Serial processing of object identification and spatial layout 47
38 Stage 1: Pre-Attentive Processing Rapid Parallel Automatic (Fleeting = lasting for a short time) 48
39 Stage 2: Serial Processing Relatively Slow (Incorporates Memory) Manual 49
40 Stage 1: Pre-Attentive Processing The eye moves every 200ms (so this processing occurs every 200ms-250ms) 50
41 Example
42 Example
43 A few more examples from Prof. Chris Healy at NC State 53
44 Left Side Right Side 54
45 Raise your hand if a RED DOT is present (On the left or on the right?) 55
46 56
47 57
48 Color (hue) is pre-attentively processed. 58
49 Raise your hand if a RED DOT is present 59
50 60
51 61
52 Shape is pre-attentively processed. 62
53 Determine if a RED DOT is present 63
54 64
55 65
56 Hue and shape together are NOT pre-attentively processed. 66
57 Pre-Attentive Processing length width size curvature number terminators intersection closure hue lightness flicker direction of motion binocular lustre stereoscopic depth 3-D depth cues lighting direction 67
58 Stephen Few Now You See It pg
59 Pre-Attentive à Cognitive 69
60 Gestalt Psychology Berlin, Early 1900s 70
61 Gestalt Psychology Goal was to understand pattern perception Gestalt (German) = seeing the whole picture all at once instead of a collection of parts Identified 8 Laws of Grouping 71
62 Gestalt Psychology 1. Proximity 2. Similarity 7. Good Gestalt 8. Past Experience 3. Closure 4. Symmetry 5. Common Fate 6. Continuity 72
63 How many groups are there? 73
64 74
65 Proximity 75
66 How many groups are there? 76
67 77
68 Similarity 78
69 How many shapes are there? 79
70 80
71 Closure 81
72 How many items are there? 82
73 ( ) { } [ ] 83
74 Symmetry ( ) { } [ ] 84
75 How many sets are there? 85
76 86
77 Common Fate 87
78 How many objects are there? 88
79 89
80 Continuity 90
81 How many objects are there? 91
82 92
83 Good Gestalt 93
84 What is this word? 94
85 FLIGHT 95
86 Past Experience FLIGHT 96
87 Pre-Attentive Processing Gestalt Laws 101
88 Detect Quickly 102
89 Detect quickly does NOT mean detect accurately Ideally you want both. 103
90 Angles Positions Circular areas Rectangular areas (aligned or in a treemap) Crowdsourcing Graphical Perception: Using Mechanical Turk to Assess Visualization Design.Heer and Bostock. Proc ACM Conf. Human Factors in Computing Systems (CHI) 2010, p
91 Crowdsourced Results Positions Angles Circular areas Rectangular areas (aligned or in a treemap) Log Error Crowdsourcing Graphical Perception: Using Mechanical Turk to Assess Visualization Design.Heer and Bostock. Proc ACM Conf. Human Factors in Computing Systems (CHI) 2010, p
92 More accurate I Position I IMll 1 I Length F-l Less accurate Iha I0.I I rl l kj cl Color mot Shown) Volume I I Mackinlay,
93 Stephen Few Now You See It pg
94 What does this tell us? 108
95 Barcharts, scatterplots, and line charts are really effective for quantitative data
96 (and for statistical distributions) Tukey Box Plots 113
97 Outliers Largest < Q IQR Largest < Q3 Median Smallest > Q1 Smallest > Q1-1.5 IQR 114
98 115
99 Tufte s Chart Principles Edward Tufte 116
100 Tufte s Chart Principles DO NOT LIE! Maximize Data-Ink Ratio Minimize Chart Junk 119
101 Tufte s Chart Principles DO NOT LIE! Maximize Data-Ink Ratio Minimize Chart Junk 120
102 121
103 Cumulative 122
104 123
105 124
106 Tufte s Chart Principles DO NOT LIE! Maximize Data-Ink Ratio Minimize Chart Junk 126
107 127
108 Chartjunk. (2017, October 05). Retrieved December 01, 2017, from 128
109 Please 130
110 No pie charts. No 2.5D charts. 131
111 132
112
113
114 135
115 PLEASE DON T EVER DO THIS! 136
116
117 But otherwise 141
118 Barcharts, scatterplots, and line charts are really effective for quantitative data
119 Anyone else bored by my color choices? 143
120 In fact, grayscale can be risky 144
121 In fact, grayscale can be risky 145
122 Color is Powerful 146
123 Color Call attention to information Increase appeal Increase memorability Another dimension to work with 147
124 Have you heard of RGB? Additive color model: colors create by mixing red, green, blue light RGB color model. (2017, November 20). Retrieved December 01, 2017, from 148
125 We see in RGB, but we don t interpret in RGB 149
126 HSV Color Model Hue Saturation Source: color picker in Affinity Designer Lightness 150
127 Hue Post & Greene,
128 Hue 152
129 Hue and Colorblindness 10% of males and 1% of females are Red-Green Colorblind 153
130 154
131 155
132 Color and Quantitative Data Can you order these (lowàhi)? 157
133 Binary Categorical Categorical Categorical Diverging Sequential via Munzner 158
134 Color Brewer for Picking Color Scales COLORBREWER 2.0. (n.d.). Retrieved December 01, 2017, from 159
135 Overview Zoom+Filter Details on Demand Shneiderman Mantra (Information-Seeking Mantra) 160
136 161
137 162
138 163
139 Where to learn more? 172
140 CS 7450 Information Visualization Every Fall 173
141 vis.gatech.edu 174
142 How to Make Good Charts Edward Tufte s One-Day Workshop Edward Tufte, Visual Display of Quantitative Information Stephen Few, Show Me the Numbers: Designing Tables and Graphs to Enlighten Designing- Enlighten/dp/ /ref=la_B001H6IQ5M_1_ 2?s=books&ie=UTF8&qid= &sr=
143 Visualization Theory Books Tamara Munzner VIS Tutorial and Book Colin Ware, Information Visualization: Perception for Design Technologies/dp/ Stephen Few, Now You See It Quantitative/dp/ /ref=pd_bxgy_b_img_z Edward Tufte, Envisioning Information Edward Tufte, Visual Explanations Edward Tufte, Beautiful Evidence Tamara Munzner, Visualization Analysis & Design Peters/dp/
144 Perception and Color Websites Chris Healy, NC State tml Color Brewer Maureen C. Stone (Color Links, Blog, Workshops) Subtleties of Color by Robert Simmon of NASA 177
145 Visualization Blogs Flowing Data by Nathan Yau Information Aesthetics by Andrew Vande Moere Information is Beautiful by David McCandless Visual.ly Blog Indexed Comic by Jessica Hagy 178
146 Infographics Visual.ly/view (wtfviz.net) 179
147 Thanks! Chad Stolper 180
148 Jessica Hagy thisisindexed.com Questions? Chad Stolper 181
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