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need to be computed between a node and a region if it is sufficiently farther away in
the tree. Zooming and focus+context are popular techniques to make visualizations
more useful. A review of the different uses of the techniques can be found in [ 1 ].
Additional information in Kernel Density Estimation can be found in [ 6 ]. The choice
of a color scheme is crucial for the interpretation of the task. To represent the
importance of the nodes in the network and density of the Tweets in heatmaps,
we use a 7-class sequential color scheme from ColorBrewer 2©. 2 Guidelines for
choosing the right color scheme can be found in [ 5 ]. The layout of the word clouds
to visualize text is based on the popular Wordle system by Jonathan Feinberg [ 2 ].
References
1. Andy Cockburn, Amy Karlson, and Benjamin B Bederson. A Review of Overview+Detail,
Zooming, and Focus+Context Interfaces. ACM Computing Surveys (CSUR) , 41(1):2, 2008.
2. Jonathan Feinberg. Wordle. Beautiful Visualization , pages 37-58, 2010.
3. Thomas MJ Fruchterman and Edward M Reingold. Graph Drawing by Force-Directed Place-
ment. Software: Practice and experience , 21(11):1129-1164, 1991.
4. Ben Shneiderman. The Eyes Have It: A Task By Data Type Taxonomy for Information
Visualizations. In Visual Languages, 1996. Proceedings., IEEE Symposium on , pages 336-343.
IEEE, 1996.
5. Julie Steele and Noah Iliinsky. Beautiful Visualization . O'Reilly Media, 2010.
6. Tan Pang-Ning, Michael Steinbach, and Vipin Kumar. Introduction to Data Mining . Pearson
Education, 2007.
2 http://colorbrewer2.org/
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