Introduction to Data Visualizations
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VISUALIZING DATA by joel laumans
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Introduction to Data Visualizations
Transcript of Introduction to Data Visualizations
VISUALIZING DATA by joel laumans
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“Data graphics visually display measured quantities by means of the combined use of points,
lines, a coordinate system, numbers, symbols, words, shading, and color.”
Edward R. Tufte
Don’t just substitute tables,data visualizations should do much more!
“Excellence in statistical graphics consists of complex ideas communicated with clarity,
precision, and efficiency.”
Edward R. Tufte
Graphical Excellence
Edward R. Tufte
What data graphics should do:
Show the dataDon’t distort the dataMake large data sets coherentServe a clear purposeReveal data at different levels (overview - detailed)
Be accurate
Lie Factor
size of effect shown in graphic
size of effect in data
Be accurate
Lie Factor
size of effect shown in graphic
size of effect in data
Be accurate
Lie Factor
size of effect shown in graphic
size of effect in data
geographic other
How is your data organized?
linear tabular hierarchical networked
from Jenifer Tidwell
from Jenifer Tidwell
Find numbers greater than 1.0
from Jenifer Tidwell
Find numbers greater than 1.0
“Certain visual features operate ‘preattentively:’ they convey information
before the viewer pays conscious attention.”
Jenifer Tidwell
8 preattentive variables
color hue
position and alignment
color brightness
orientation
color saturation
size
texture
shape
Visitors Linear
Visitors Cartographic
any questions?
