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Lookup NU author(s): Dr Osman Akbulut, Lucy Mclaughlin, Dr Tong XinORCiD, Dr Matthew ForshawORCiD, Professor Nick HollimanORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023 The Author(s). Node-link visual representation is a widely used tool that allows decision-makers to see details about a network through the appropriate choice of visual metaphor. However, existing visualization methods are not always effective and efficient in representing bivariate graph-based data. This study proposes a novel node-link visual model – visual entropy (Vizent) graph – to effectively represent both primary and secondary values, such as uncertainty, on the edges simultaneously. We performed two user studies to demonstrate the efficiency and effectiveness of our approach in the context of static node-link diagrams. In the first experiment, we evaluated the performance of the Vizent design to determine if it performed equally well or better than existing alternatives in terms of response time and accuracy. Three static visual encodings that use two visual cues were selected from the literature for comparison: Width-Lightness, Saturation-Transparency, and Numerical values. We compared the Vizent design to the selected visual encodings on various graphs ranging in complexity from 5 to 25 edges for three different tasks. The participants achieved higher accuracy of their responses using Vizent and Numerical values; however, both Width-Lightness and Saturation-Transparency did not show equal performance for all tasks. Our results suggest that increasing graph size has no impact on Vizent in terms of response time and accuracy. The performance of the Vizent graph was then compared to the Numerical values visualization. The Wilcoxon signed-rank test revealed that mean response time in seconds was significantly less when the Vizent graphs were presented, while no significant difference in accuracy was found. The results from the experiments are encouraging and we believe justify using the Vizent graph as a good alternative to traditional methods for representing bivariate data in the context of node-link diagrams.
Author(s): Akbulut O, McLaughlin L, Xin T, Forshaw M, Holliman NS
Publication type: Article
Publication status: Published
Journal: Visual Informatics
Year: 2023
Volume: 7
Issue: 3
Pages: 22-36
Print publication date: 01/09/2023
Online publication date: 25/06/2023
Acceptance date: 21/06/2023
Date deposited: 03/10/2023
ISSN (print): 2543-2656
ISSN (electronic): 2468-502X
Publisher: Elsevier BV
URL: https://doi.org/10.1016/j.visinf.2023.06.003
DOI: 10.1016/j.visinf.2023.06.003
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