Browsing by Author "Rathish, Harith"

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    A Framework for Axis Breaks in Charts
    (The Eurographics Association, 2024) Thorsøe, Rasmus; Locher, Peter; Rathish, Harith; Schulz, Hans-Jörg; Linsen, Lars; Thies, Justus
    Axis breaks are used in charts, for example, to reduce whitespace, to accommodate outliers, or to show data at different scales. Proposed in the 1980s, axis breaks have not gotten much attention since then in terms of what characterizes ''good'' breaks, how many of them to introduce, and where to best place them? To answer these questions, we propose a five-step framework that specifies (1) the number of breaks, (2) their position, (3) the scaling of the resulting subaxes, (4) the ''niceness'' of the breaks, and (5) the formatting of the breaks. To apply this framework, we introduce a new metric, called skew, to quantify how unevenly distributed points are along an axis. Skew is then used as a cost function to formulate the search for optimal axis breaks as a clustering problem, which we solve by applying a dynamic k-means algorithm. We apply our framework specifically to Parallel Coordinate Plots and compare our algorithmic solution to established methods like percentile breaks and Jenks natural breaks. An interactive testbed to try our framework as well as its source code are made freely available.
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    LaNe Plot: A Visual Fingerprinting Technique for Sequential Data
    (The Eurographics Association, 2024) Rathish, Harith; Picón, Ginés Carreto; Schulz, Hans-Jörg; Kucher, Kostiantyn; Diehl, Alexandra; Gillmann, Christina
    Visual summaries of sequential data are often used to identify common trends at a glance. In this poster, we propose a visualization technique to fingerprint sequential data by showing the difference between contiguous data points. For each data point in the sequence, we visualize the difference between itself and the last data point as well as the next data point. As an application, we visualized the revision histories of Wikipedia articles to demonstrate the exploratory value of this technique.