Journal Paper

#37 

@article{Gad2015, title={ThemeDelta: Dynamic Segmentations over Temporal Topic Models}, author={Samah Gad and Waqas Javed and Sohaib Ghani and Niklas Elmqvist and Tom Ewing and Keith N. Hampton and Naren Ramakrishnan}, url={http://www.umiacs.umd.edu/~elm/projects/theme-delta/theme-delta.pdf}, year={2015}, date={2015-02-17}, journal={IEEE Transactions on Visualization and Computer Graphics}, volume={21}, number={5}, pages={672--685}, abstract={We present ThemeDelta, a visual analytics system for extracting and visualizing temporal trends, clustering, and reorganization in time-indexed textual datasets. ThemeDelta is supported by a dynamic temporal segmentation algorithm that integrates with topic modeling algorithms to identify change points where significant shifts in topics occur. This algorithm detects not only the clustering and associations of keywords in a time period, but also their convergence into topics (groups of keywords) that may later diverge into new groups. The visual representation of ThemeDelta uses sinuous, variable-width lines to show this evolution on a timeline, utilizing color for categories, and line width for keyword strength. We demonstrate how interaction with ThemeDelta helps capture the rise and fall of topics by analyzing archives of historical newspapers, of U.S. presidential campaign speeches, and of social messages collected through iNeighbors, a web-based social website. ThemeDelta was evaluated using a qualitative expert user study involving three researchers from rhetoric and history using the historical newspapers corpus.}, keywords={}, }