VISUALIZING DATA by joel laumans

“ 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

www.processing.org

Visitors Linear

Visitors Cartographic

any questions?