Introduction to Data Visualizations
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Transcript of Introduction to Data Visualizations
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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
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Don’t just substitute tables,data visualizations should do much more!
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“Excellence in statistical graphics consists of complex ideas communicated with clarity,
precision, and efficiency.”
Edward R. Tufte
Graphical Excellence
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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)
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Be accurate
Lie Factor
size of effect shown in graphic
size of effect in data
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Be accurate
Lie Factor
size of effect shown in graphic
size of effect in data
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Be accurate
Lie Factor
size of effect shown in graphic
size of effect in data
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geographic other
How is your data organized?
linear tabular hierarchical networked
from Jenifer Tidwell
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from Jenifer Tidwell
Find numbers greater than 1.0
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from Jenifer Tidwell
Find numbers greater than 1.0
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“Certain visual features operate ‘preattentively:’ they convey information
before the viewer pays conscious attention.”
Jenifer Tidwell
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8 preattentive variables
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color hue
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position and alignment
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color brightness
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orientation
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color saturation
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size
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texture
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shape
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Visitors Linear
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Visitors Cartographic
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any questions?