UMBC ebiquity » visualization http://ebiquity.umbc.edu/blogger EBB is the ebiquity research group\\\'s blog at the University of Maryland, Baltimore County (UMBC). We focus on technologies that facilitate the design, implementation and control of distributed, intelligent information systems -- mobile and pervasive computing, ad hoc networking, multiagent systems, knowledge representation and reasoning, and the semantic web. As the tides of technology ebb and flow, we hope the good ideas wash up on our beach and the bad ones drift back out to sea. Fri, 20 Nov 2009 13:50:39 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 How to choose the right chart for your data http://ebiquity.umbc.edu/blogger/2009/01/25/how-to-choose-the-right-chart-for-your-data/ http://ebiquity.umbc.edu/blogger/2009/01/25/how-to-choose-the-right-chart-for-your-data/#comments Sun, 25 Jan 2009 15:01:47 +0000 Tim Finin http://ebiquity.umbc.edu/blogger/?p=1740 There are lots of good systems, including excel and other spreadsheet tools, that can visualize your data in various kinds of graphs. it can sometimes by a little daunting, however, to figure out which kind of chart to use. The version of excel running on my laptop, for example, asks me to choose from more than 70 kinds of charts. Of course, many of the variations are obviously stylistic — 2D vs 3D bar charts — but there are still a lot of options.

A link to a great data visualization cheat sheet on How to choose a chart is doing well on Hacker News today. The graphic was created by Andrew Abela and posted on his blog in Choosing a good chart over three years ago.

“Here’s something we came up with to help you consider which chart to use. It was inspired by the table in Gene Zelazny’s classic work Saying It With Charts (p. 27 in the 4th. ed)”


How to choose the right chart for your data

Abela developed this aid as part of his Extreme Presentation method for “designing presentations that drive action”. Viewing his Extreme Presentation blog you can find versions of this chart aide that have been translated into other languages

]]> http://ebiquity.umbc.edu/blogger/2009/01/25/how-to-choose-the-right-chart-for-your-data/feed/ 0 Eigenfactor.org measures and visualizes journal impact http://ebiquity.umbc.edu/blogger/2008/12/19/eigenfactororg-measures-and-visualizes-scientific-journal-impact/ http://ebiquity.umbc.edu/blogger/2008/12/19/eigenfactororg-measures-and-visualizes-scientific-journal-impact/#comments Fri, 19 Dec 2008 06:01:09 +0000 Tim Finin http://ebiquity.umbc.edu/blogger/?p=1702 eigenfactor.org is a fascinating site that is exploring new ways to measure and visualize the importance or journals to scientific communities. The site is a result of work by the Bergstrom lab in the Department of Biology at the University of Washington. The project defines two metrics for scientific journals based on a page-rank like algorithm applied to citation graphs.

“A journal’s Eigenfactor score is our measure of the journal’s total importance to the scientific community. With all else equal, a journal’s Eigenfactor score doubles when it doubles in size. Thus a very large journal such as the Journal of Biological Chemistry which publishes more than 6,000 articles annually, will have extremely high Eigenfactor scores simply based upon its size. Eigenfactor scores are scaled so that the sum of the Eigenfactor scores of all journals listed in Thomson’s Journal Citation Reports (JCR) is 100.
…
A journal’s Article Influence score is a measure of the average influence of each of its articles over the first five years after publication. Article Influence measures the average influence, per article, of the papers in a journal. As such, it is comparable to Thomson Scientific’s widely-used Impact Factor. Article Influence scores are normalized so that the mean article in the entire Thomson Journal Citation Reports (JCR) database has an article influence of 1.00.”

For example, here are the ISI-indexed journals in the AI subject category ranked by the Article Influence score for 2006.

The site makes good use of GoogleDoc’s motion charts to visualize the changes of metrics for top journals in a subject area. You can also interactively explore maps that show the influence of different subject categories on one another as estimated from journal citations.

Map of Science

The details of the approach and algorithms are available in various papers by Bergstrom and his colleagues, such as

M. Rosvall and C. T. Bergstrom, Maps of random walks on complex networks reveal community structure, Proceedings of the National Academy of Sciences USA. 105:1118-1123. Also arXiv physics.soc-ph/0707.0609v3 [PDF]

(spotted on Steve Hsu’s blog)

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