1. 1. Mithileysh Sathiyanarayanan and Nikolay Burlutskiy University of Brighton, UK {M.Sathiyanarayanan, N.Burlutskiy}@brighton.ac.uk VisionNet 2015, co-located with ICACCI 2015 Orissa, India Visualizing Social Networks using a Treemap overlaid with a Graph
2. 2. Motivation These days, people use social networks in their communication every day. For example, Facebook, Twitter, LinkedIn, and Instagram are widely used by people all around the world. However, the complexity and scale of these networks motivates people to design various visualizations for the exploration of data
3. 3. What is the challenge? Visualization of a social network using an Euler diagram is challenged by a Treemap diagram. The main motivation for this challenge is to evaluate the performance, limitations and usefulness of the designed visualizations.
4. 4. Addressing the Problem Euler diagram and treemap diagram were designed to visualize a Twitter network. Nodes were added to convey more information. Edges were added to the Nodes - Euler diagram with graph and a treemap diagram with graph were designed. We varied the number of Curves, Edges, and Nodes. These diagrams were evaluated by the participants. Finally, the results for the evaluation of a Twitter network visualization were demonstrated and discussed.
5. 5. Design of the Study Diagrams were drawn using the software Inkscape. We considered three different sizes of curves/rectangles: small, medium and large. 23 participants were randomly selected from the University of Brighton for the study. Eighteen of the participants were male, five female, and their age varied from 20 to 29 years with 24.3 years as the mean value for their age. We used a software called as ``Research Vehicle, developed by Andrew Blake of University of Brighton, for the participants to answer the questions. This software recorded both the time taken and the number of errors committed.
6. 6. Diagrams Type 1 Euler Diagram Treemap Diagram
7. 7. Diagrams Type 2 Euler Diagram with nodes Treemap Diagram with nodes
8. 8. Diagram Type 3 Euler Diagram overlaid by a graph
9. 9. Diagram Type 3 Treemap Diagram overlaid by a graph
10. 10. Results 23 participants using the 9 variations of treemaps along with the 9 variations of Euler diagram visualizations are shown in the Table. Note: M(T) is the mean value for the response time and Sd(T) is a standard deviation. M(E) is the mean value for the error rate and Sd(E) is a standard deviation.
11. 11. Discussion Accuracy performance - t-test did not reveal any significant difference between treemaps and Euler diagrams at any of the three levels. Response time - analysis of variance (ANOVA) did not reveal any significant difference between treemaps and Euler diagrams at any of the three levels.
12. 12. Future Works We will include interaction in the visualization in order to popularize the visualization as a tool for social network analysis. The main issue of fusing graphs with treemaps and Euler diagrams is in scalability, thus, it is necessary to address this issue in further research. This work can be considered as a performance evaluation for the novel type of social network visualization based on a combination of a treemap and a graph. In the next study, it is planned to consider different layouts, topological properties and aesthetic properties for evaluating these visualizations.
13. 13. Thank You and Any Questions?