This article will give a brief introduction to VanGogh and will show
how such an analysis of network data works in general. As an example
dataset, I will introduce the "Augsburg Traffic" dataset, that deals
with traffic flows in Augsburg.
Graphics software for the exploratory visual analysis of graph data
should include the following: graph layout methods; a variety of
displays and methods for exploring variables on both nodes and edges,
including methods that allow these covariate displays to be linked to
the network view; methods for thinning or otherwise trimming a large
graph. In addition, the power of the visualization software is
greater if it can be smoothly linked to an extensible and interactive
statistics environment.
In this demo, we will show how these goals have been addressed
in GGobi (www.ggobi.org) through
its data format, architecture, graphical user
interface design, and its relationship to the R software.
Zoomgraph
Eytan Adar and Josh Tyler
Zoomgraph is a data-driven graph exploration project. Along with a
"zoomable" user interface which lets one explore graphs on an infinite
plane, Zoomgraph features an interactive language that lets users
manipulate, lay out, and analyze graph structures. Graphs exist in
Zoomgraph not simply as nodes and edges but entities with attributes
that can be used to query, filter, and manipulate the graph.
Attributes can range from employee salaries for nodes representing
employees, bandwidth for communication edges, and DNA sequences
forgene nodes. Zoomgraph also supports animating dynamic graphs,
communication with R, and various other features. More information on
the project is available at:
http://www.hpl.hp.com/shl/projects/graphs/
Visualizing Augsburg Traffic Data with VanGogh
René Keller
Visualizing networks is a common task in statistics. As networks can
be very large, new approaches must be tested. Techniques that just
concentrate on the visualization of the network itself can give
valuable information, but other graphics can help as well. This makes
interactive features such as linking and selection necessary. VanGogh
is a software solution that deals with networks in an interactive
way to find new and interesting properties of a given dataset.
Exploratory Data Analysis of Graphs in GGobi
Deborah F. Swayne, Duncan Temple Lang, Di Cook, and Andreas Buja
Most of the visualization software available for working with graphs
has come from outside statistics and has not included the kind of
interaction that statisticians have come to expect. At the same time,
most of the exploratory visualization software available to
statisticians has made no provision for the special structure of
graphs.