ThemeRiver ™ is a prototype system that visualizes thematic variations over time within a large collection of documents. The “river ” flows from left to right through time, changing width to depict changes in thematic strength of temporally associated documents. Colored “currents ” flowing within the river narrow or widen to indicate decreases or increases in the strength of an individual topic or a group of topics in the associated documents. The river is shown within the context of a timeline and a corresponding textual presentation of external events
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