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An Intro to Data Visualization Presented by John Ashley, Nik Reed & DanWales
August 19, 2014
Thank you for being here today
Presenter:
John Ashley Director, Financial Systems & Projects Cozen O’Connor
WHAT IS
EXPLORE DATA
REVEAL
&
HALLEY
http://euclid.psych.yorku.ca/
PLAYFAIR
Wikipedia
MINARD
Wikipedia
1,200
1,400
1,600
1,800
2,000
2,200
2,400
Charlotte Atlanta Boston Houston Chicago
TUKEY
Data graphics should
draw the viewer’s
attention to the sense
and substance of the data,
not to something else.
The Visual Display of Quantitative Information, Edward R. Tufte, 1983
show. the.
DATA.
data-ink
The Visual Display of Quantitative Information, Edward R. Tufte, 1983
ratio
avoid DISTORTION
presentation
exploration
TECHNIQUE
STORY WHAT’S THE
Plot the data
Position
Length
Angle
Direction
Area
Volume
Saturation
Hue
VISUAL CUES
Ranked High to Low on
Perception Accuracy
2
3
4
5
6
7
January February March April
length
strategically color
use
0
1
2
3
4
5
6
7
January February March April
0
1
2
3
4
5
6
7
January February March April
Source: New York Times
The smaller circle in each pair is
what percentage of the area of
the larger circle?
Beware of Circles
80% 65% 50% 35% 25% 15%
SYSTEM COORDINATE
Pie Danger!
http://www.columnfivemedia.com/work-items/infographic-true-colors-what-your-brand-colors-say-about-your-business
Pie Danger!
http://www.columnfivemedia.com/work-items/infographic-true-colors-what-your-brand-colors-say-about-your-business
SCALE
0
1
2
3
4
5
6
Category 1 Category 2 Category 3 Category 4
Numerical
Categorical
0
5
10
15
20
25
30
1
3
5
7
9
11
13
15
SCALE APPROPRIATELY
CONTEXT Rising Sales for
ACME Dynamite
Alpha
Omega
Theta
Gamma
Epsilon
Beta
Focus
LABEL ACCURATELY
REVIEW EDIT
What you show
can be as important as
what you hide.
~Alberto Cairo
Resources
Data Points
Nathan Yau
The Functional Art
Alberto Cairo
The Visual Display
of Quantitative Information
Edward Tufte
The Wall Street Journal
Guide to Information Graphics
Dona Wong
Octagon and Emails
Ranking lawyers against each other
Impact on Behavior
Phenomenal—Speeds drop 16 days over the recession
DATA VISUALIZATION AN INTRO TO