Histographs
| Graphs are a classic tool for visualizing information. However, with the volume and complexity of today's information, they often break down. How might one look at hundreds or even thousands of graphs at once? Clearly simply overlaying them won't work -- the topmost graphs will hide or occlude most of those that remain. Histographs are simple but powerful technique for solving this occlusion problem. The key insight is that rather than mapping data frequency to space, as histograms do, one might map frequency to color. |
| Project members: Pin Ren (NU CS), Torben Anderson (NU Finance) & Ben Watson. |
Publications
| P. Ren & B.A. Watson (2004). Histographs: interactive clustering of stacked graphs (pdf). IEEE Information Visualization, Interactive Poster session, to appear. |
Imagery
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A market nadir In this histograph, most of these 200-plus stocks reach a nadir early in the month. Dark regions are data-rich. |
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Daily market trends Here hue reveals strong daily or intra-day price trends. Red indicates that price is declining, green increasing. |
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Rising stocks Here the user outlines a rising price profile, and matching stocks are automatically selected. |