NetVisia: Heat Map & Matrix Visualization of Dynamic Social Network Statistics & Content SocialCom 2011 MIT - Boston, MA Robert Gove, Nick Gramsky, Rose Kirby, Emre Sefer, Cody Dunne, Awalin Sopan, Ben Shneiderman, Meirav Taieb-Maimon Presented by: Nick Gramsky – University of Maryland

Challenges with Node/Link Diagrams Great Overview for Composition Difficult to analyze Temporally Identifying changes requires multiple pictures Relies on memory

STICK Data Set STICK Data Set – 2004 Sized on degree

STICK Data Set STICK Data Set – 2005 Sized on degree What changed? Whose degree increased? Whose degree had a bigger change?

Visualizing Network Evolution +

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What is NetVisia Tool for Visualizing Network Evolution Abandons Link-Node Diagrams for Heat Maps / Adjacency Matrices Clustering Alignment Any type of network Social Computer Visualize / Analyze / Provide Insight on: Conventional Network Attributes User-defined Node / Edge content Ex: Keywords in co-authorship dataset

NetVisia - Overview

STICK DataSet – Clustered View Nodes – Business concepts & entities Edges – Co-occurrence of terms Analysis shows: Outliers Bad Data Suggests discrete periods for investigation

Stick DataSet – Adjacency Matrix Deep dive discrete time period Metrics for node- node relationships Cluster identification 2005

Stick DataSet – Adjacency Matrix

2004 InfoViz Co-authorship Dataset Info-Viz Co-authorship 840 distinct authors 1995 to 2004 Nodes are authors Edges are co-authored papers Clustered & Aligned

2004 InfoViz Co-authorship Dataset Info-Viz Co-authorship 840 distinct authors 1995 to 2004 Nodes are authors Edges are co-authored papers Clustered & Aligned Recognition of behavior pattern Most co-author only one paper

2008 VAST Cell Phone Challenge Cell phone calls in a 10-day period / 12-hour periods Nodes – People Edges – Phone Calls Summary shows cyclical behavior Clustering shows shift in identities of members

Challenges / Future Work Challenges Data Structures Future Work Responsiveness Additional Features Edge representation in overview window Tooltips

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