Visualizing ordered bivariate data on node-link diagrams  

作　　者：Osman Akbulut Lucy McLaughlin Tong Xin Matthew Forshaw Nicolas S.Holliman 

机构地区：[1]School of Computing,Newcastle University,1 Science Square,Newcastle upon Tyne,NE45TG,United Kingdom [2]CUSP London,Department of Informatics,King’s College London,Bush House,30 Aldwych,London,WC2B 4BG,United Kingdom [3]Department of Computer Engineering,Faculty of Engineering,Duzce University,Duzce,Turkey

出　　处：《Visual Informatics》2023年第3期22-36,共15页可视信息学（英文）

基　　金：the Ministry of National Education,Turkey for financially supporting the first author’s PhD study at Newcastle University,UK.

摘　　要：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 nodelink 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.

关 键 词：Bivariate network visualization Edge visualization Uncertainty visualization Node-link diagram Quantitative evaluation 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]