session 9: visualization
TRANSCRIPT
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INFM 603: Information Technology and Organizational Context
Jimmy Lin The iSchool ���University of Maryland��� Wednesday, April 2, 2014
Session 9: Visualization
Material borrowed from slides by Ben Shneiderman for his visualization course
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Visualization ¢ Why visualizations?
l Human perceptual skills are remarkable l Human image storage storage is fast and vast
¢ What are visualizations for? l A good visualization tells a story
l A great visualization delivers insight
¢ Science as well as an art…
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Raw Ingredients ¢ Types of data
l Categorical data l Ordinal data
l Numerical data
¢ Ways of representing data l Height
l Width
l Thickness l Area
l Angles
l Size
l Shape
l Color
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Static vs. Interactive ¢ Interactive visualizations allow users to “explore” the data
l Overview l Zoom and filter
l Details-on-demand
¢ Brushing and linking is a powerful technique
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Info Porn ¢ Informative visualizations vs. info porn
¢ Beware of infographics and chart junk
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http://infosthetics.com/archives/chart_junk_effective.jpg
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http://thedoublethink.com/wp-content/uploads/2009/07/keynote-chartjunk.jpg
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http://www.captech.org/vcp/mathmania/February/images/GasGraph.jpg
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Compare: New York Times interactive visualization
http://junkcharts.typepad.com/junk_charts/music/
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Line Graphs (+ Variants) ¢ Suitable for what types of data?
¢ What makes a good line graph?
http://nces.ed.gov/nceskids/help/user_guide/graph/images/line.jpg
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Stacked Graphs ¢ Multiple time-series data “stacked” on top of each other
l Useful for showing aggregates
¢ Sometimes called “stream graphs”
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http://www.babynamewizard.com/voyager#
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http://hci.stanford.edu/jheer/files/zoo/
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http://hci.stanford.edu/jheer/files/zoo/
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Small Multiples ¢ Multiple small graphs arranged in a grid
¢ Advantages and disadvantages?
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http://informationdesignmdippold.files.wordpress.com/2011/06/good-id-1.jpg
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Spark Lines
http://www.plainlanguage.com.au/sparklines.png
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Bar Graphs (+ Variants) ¢ Suitable for what types of data?
¢ Following examples from d3.js
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Scatterplots ¢ Suitable for what types of data?
¢ Note availability of other ways to encode data at points
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http://www.gapminder.org/
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Pie Charts (+ Variants) ¢ Suitable for what types of data?
¢ Different ways for labeling
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More Chart Junk
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Sunburst Trees
http://hci.stanford.edu/jheer/files/zoo/
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Icicle Diagrams
http://hci.stanford.edu/jheer/files/zoo/
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Visualizing Hierarchies
http://hci.stanford.edu/jheer/files/zoo/
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TreeMaps ¢ Useful for representing hierarchical relationships
¢ Two mechanisms for coding information:
l Size and Color l Physical location of boxes not usually meaningful
¢ Requires learning to read
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http://www.smartmoney.com/map-of-the-market/
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Market mixed, February 8, 2008: ���Energy & Technology up, Financial & Health Care down
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Market rises 319 points, November 13, 2007: ���Five exceptions
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Heatmaps ¢ Data represented in a matrix
¢ Matrix values are code coded
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http://eyetools.com/images/blog/2/google/eyetools_google_search.jpg
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Miguel Rios and Jimmy Lin. Visualizing the “Pulse” of World Cities on Twitter. ICWSM 2013.
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Miguel Rios and Jimmy Lin. Visualizing the “Pulse” of World Cities on Twitter. ICWSM 2013.
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Miguel Rios and Jimmy Lin. Visualizing the “Pulse” of World Cities on Twitter. ICWSM 2013.
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Miguel Rios and Jimmy Lin. Visualizing the “Pulse” of World Cities on Twitter. ICWSM 2013.
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Miguel Rios and Jimmy Lin. Visualizing the “Pulse” of World Cities on Twitter. ICWSM 2013.
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Choropleth Maps
http://hci.stanford.edu/jheer/files/zoo/
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http://www.geog.ucsb.edu/~jeff/gis/choropleth_maps.html
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http://www.excelcharts.com/blog/animation-small-multiples-growth-walmart-excel-edition/
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Small Multiples vs. Animations ¢ Advantages and disadvantages?
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Visualizing Networks ¢ Types of networks: social networks, interaction networks,
biological networks, computer networks, etc.
¢ Standard algorithm uses force-directed layout
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